A senior honors thesis is a chance to investigate an idea, theoretical issue, policy problem, or historical situation of keen economic interest. All senior thesis writers take an Ec 985 Senior Thesis Tutorials. Resources and Details on Writing an Ec Thesis Check out Why to Write a Senior Thesis in Economics by Professor. On Harvard’s campus during late March and early April, one word strikes both fear and excitement in the hearts of both juniors and seniors alike: the thesis. A senior thesis is a project taken on by undergraduates during their senior year of college and serves as an in depth research paper that almost serves as a culmination of the work they have done over their past four years. Theses can vary in length depending on what concentration a person is in, but normally the finished product will range between 50-100 pages when all is said and done. How can anyone write that much on one topic in less than a year? My concentration, Social Studies, requires its students to write a thesis in order to graduate, one of only a handful of concentrations with that requirement. For students concentrating in something that does not require a thesis to graduate, a thesis is always an option to take on their senior year, and many students do decide to pursue the project. Some students write about a personal experience they have had, some go the creative route and write a novel or collection of short stories, some write on research they have been conducting in lab throughout their undergraduate years, and some, like me, take on a whole new project for their senior year. Because Social Studies requires students to write a thesis, there is a great network of help and support for juniors and seniors throughout the entire process.
The course requirements for the honors track are slightly different from the non-honors track, but the most important difference between the two is the thesis project. The thesis project is an intensive one that lasts for most of the student's senior year, with preparation for the project often beginning the summer before the. Enrollees say the ability to pursue vastly different disciplines, the close social connections forged through the M. Some students praised the final report released by a University-wide task force on inclusion and belonging last week, noting the report's authors clearly took campus feedback on an earlier draft into account. program, and later career benefits derived from holding two degrees render the challenging curriculum more than worth it. At the event, titled "Toxic Tales, Body Burdens, and Climatic Conundrums," speakers ranging from professors to current students spoke about issues like climate change, ecotourism, and race relations. The authors of the letter wrote that, based on their interactions with the Title IX Office, Harvard is incapable of conducting its avowed “full and fair” investigation into the allegations against Dominguez.
The concentration in Environmental Science and Public Policy. and I think my undergraduate education. Learn more https//harvard.edu/senior-thesis. Students have found labs in the psych, chem, and engineering departments. Feel free to search and let us know when you decide. In addition to these online resources, Margaret Lynch, our Undergraduate Research Advisor is available to meet with students who are early in their lab search. Check out the resources on the “Research Advising” website. We recommend that you identify anywhere from 3-10 labs that interest you. If you’d like help refining your list or would like input on the labs you have selected, Dr. Magnotti will be happy to go over your list in a meeting.
The senior thesis is typically the most challenging writing project undertaken by undergraduate students. The writing guides below aim to introduce students both to the specific methods and conventions of writing original research in their area of concentration and to effective writing process. ADDITIONAL RESOURCES. If I told myself last year (or any year in the past really) that I would be spending my senior year of college conducting independent research and writing a long (very, very long) research paper, I would have been simultaneously in denial and terrified. Yet, I’ve spent the past few months conducting research for my senior thesis paper! A senior thesis is an independent research project current or rising seniors take on to showcase their interests and experiences within their field of study. The written reports for each thesis writer may vary in length, but it is almost undoubtedly the longest paper students have ever written thus far! For some students, writing a senior thesis is a concentration requirement, so they have no choice but to go through the process.
A senior thesis is more than a big project write-up. It is documentation of an attempt to contribute to the general understanding of some problem of computer science, together with exposition that sets the work in the context of what has come before and what might follow. In computer science, some theses involve building. Next, Char Miller, Pomona College, talks about open access, digital publishing, and the undergraduate thesis. Open Access to Undergraduate and Graduate Theses and Dissertations: Faculty from Pomona and Harvard Voice Their Views, What are Yours? Char has worked closely with the Claremont Colleges Library to open undergraduate work to the public, which has provided a “clarifying urgency” in their research and writing. To view the video of Char's talk, see the arrow at the end of this record. Claremont Colleges Library Founders Room, Claremont, CA First, Harvard University faculty talk about open access, publishing and the dissertation (8 minute video). Professor Miller's talk was first given as the opening keynote speech at the USETDA Conference in July 2013. Char Miller is Director of the Environmental Analysis Program at Pomona College and the W. Next, Char Miller, Pomona College, talks about open access, digital publishing, and the undergraduate thesis. Professor Miller's talk was first given as the opening keynote speech at the USETDA Conference in July 2013. This Claremont Colleges intercollegiate major is deeply interdisciplinary in its focus – which means that seniors are writing theses in the sciences, social sciences, and humanities. Char has worked closely with the Claremont Colleges Library to open undergraduate work to the public, which has provided a “clarifying urgency” in their research and writing. He is author of a number of award-winning books and articles. Miller is a regular contributor of essays, commentary, and reviews to professional journals, newspapers, and online media; his blog, Golden Green, explores environmental issues in California and the West for Miller joined the Environmental Analysis Program in 2007, after a 26-year stint at Trinity University in San Antonio, Texas. This Claremont Colleges intercollegiate major is deeply interdisciplinary in its focus – which means that seniors are writing theses in the sciences, social sciences, and humanities. He is author of a number of award-winning books and articles. Miller is a regular contributor of essays, commentary, and reviews to professional journals, newspapers, and online media; his blog, Golden Green, explores environmental issues in California and the West for Miller joined the Environmental Analysis Program in 2007, after a 26-year stint at Trinity University in San Antonio, Texas. To view the video of Char's talk, see the arrow at the end of this record.
Description This folder contains an electrostatic copy of the final version of John F. Kennedy's Harvard University senior thesis, Appeasement at Munich The Inevitable Result of the Slowness of Conversion of the British Democracy from a Disarmament to a Rearmament Policy. Series Name Manuscripts. Series Number 10. (I understand that Brad Pitt’s involvement was a not irrelevant consideration in the decision.) I’m sure I’ll be back with more on the book once I’ve had a chance to read it, but Monday’s brings an interesting bit of information: in the acknowledgements, Lewis recognizes “A. Barnett-Hart, a Harvard undergraduate who had just written a thesis about the market for subprime mortgage-backed CDOs that remains more interesting than any single piece of Wall Street research on the subject.” (HT: Rolfe Winkler) Barnett-Hart, pictured below left, is now a 24-year-old financial analyst at a large New York investment bank. (dated March 19, 2009, a year ago yesterday), “was awarded summa cum laude and won virtually every thesis honor, including the Harvard Hoopes Prize for outstanding scholarly work.” Using hand-collected data from 735 ABS CDO’s, Barnett-Hart draws three main findings on the adverse performance of CDOs: First, the properties of the CDO collateral, including asset class and vintage, are the most important factor in explaining the variation in CDO performance. In particular, CDOs with a high level of exposure to residential mortgage securities, specifically those backed by subprime and Alt-A adjustable-rate mortgages, consistently underperformed other CDOs. In addition, losses were higher for CDOs with a large amount of 20 vintage collateral. Secondly, the identity of the CDO underwriter is a significant predictor for CDO performance, even after controlling for collateral type. Morgan’s CDOs consistently underperformed, while those from Goldman Sachs were among the top performers. This finding shows that there was variation among banks’ underwriting standards, with some banks consistently more careful in their collateral selection. Lastly, the original credit ratings assigned to CDOs failed to capture the true risks of these securities. There was a striking uniformity in the initial proportion of AAA given to all CDO deals, despite the wide variety in the characteristics of their collateral and the quality of their underwriters. On the whole, the original credit ratings of CDO bonds, most notably those given to the senior tranches, were grossly inflated.
While I can't speak from the perspective of someone from the College itself, I can speak from the perspective of someone who, in the process of attaining a Master's from Harvard in an interdisciplinary degree in psychology, neuroscience, and learning, helped run the workshops for Mind, Brain, and Behavior MBB seniors. BOSTON — While other Harvard University students were writing papers for their senior theses, Obasi Shaw was busy rapping his. Shaw is the first student in Harvard’s history to submit a rap album as a senior thesis in the English Department, the university said. The album, called “Liminal Minds,” has earned the equivalent of an A-minus grade, good enough to guarantee that Shaw will graduate with honors next week. Count Shaw among those most surprised by the success. “I never thought it would be accepted by Harvard,” said Shaw, a 20-year-old from Stone Mountain, Georgia, a suburb of Atlanta. “I didn’t think they would respect rap as an art form enough for me to do it.” Shaw describes the 10-track album as a dark and moody take on what it means to be black in America. Each song is told from a different character’s perspective, an idea inspired by Geoffrey Chaucer’s 14th-century classic “The Canterbury Tales.” Shaw, who’s black, also draws on the works of writer James Baldwin while tackling topics ranging from police violence to slavery. Shaw’s thesis adviser, Harvard English lecturer Josh Bell, said Shaw is a “serious artist and he’s an amazing guy.” “He was able to turn around an album that people in the English Department would like very much but also that people who like rap music might like,” Bell said.
A Guide to Writing a Senior Thesis in Government updated for 2017-18 .action_button.action_button:active.action_button:hover.action_button:focus.action_button:hover.action_button:focus .count.action_button:hover .count.action_button:focus .count:before.action_button:hover .count:before.submit_button.submit_button:active.submit_button:hover.submit_button:not(.fake_disabled):hover.submit_button:not(.fake_disabled):focus._type_serif_title_large.js-wf-loaded ._type_serif_title_large.amp-page ._type_serif_title_large@media only screen and (min-device-width:320px) and (max-device-width:360px).u-margin-left--sm.u-flex.u-flex-auto.u-flex-none.bullet. Content Wrapper:after.hidden.normal.grid_page.grid_page:before,.grid_page:after.grid_page:after.grid_page h3.grid_page h3 a.grid_page h3 a:hover.grid_page h3 a.action_button.grid_page h3 a.action_button:active.grid_page h3 a.action_button:hover.grid_page h3 a.action_button:not(.fake_disabled):hover.grid_page h3 a.action_button:not(.fake_disabled):focus.grid_pagediv. Error Banner.fade_out.modal_overlay.modal_overlay .modal_wrapper.modal_overlay .modal_wrapper.normal@media(max-width:630px)@media(max-width:630px).modal_overlay .modal_fixed_close.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:before.modal_overlay .modal_fixed_close:hover:before. Selector .selector_input_interaction .selector_input. Selector .selector_input_interaction .selector_spinner. Selector .selector_results_container.form_buttons.form_buttons a.form_buttons input[type='submit'].form_buttons .submit_button.form_buttons .submit_button.form_buttons .action_button.hover_menu.hover_menu:before,.hover_menu:after.hover_menu.show_nub:before.hover_menu.show_nub:after.hover_menu.show_nub.white_bg:after.hover_menu .hover_menu_contents.hover_menu.white_bg .hover_menu_contents.
Feb 21, 2018. Theses. Thesis - unpublished; Thesis - online. The format here should be used to cite an unpublished thesis. Note the title of the unpublished thesis is not italicised and is placed in quotation marks. Use the format for books if citing a published thesis. General Format. Dissertation hypothesis statement Spire Opt Out Quotes for dissertation acknowledgements Essay writing in hours hello sushi Quotes for dissertation acknowledgements Essay writing in hours hello sushi. acknowledgements dissertation undergraduate Resume Pdf Download Writing thesis acknowledgements phrases Writing Thesis Acknowledgements Phrases Scribd Writing thesis acknowledgements phrases Thesis acknowledgements .
Senior Honors Thesis Since students often ask for advice about the senior honors thesis, the department has summarized some of the basic information in this section. In an interdisciplinary program such as African and African American Studies, however, concentrators should bear in mind that many students especially. To the author's credit, her interesting synopsis attempts no serious evaluation of Robert's political views or suitability for Supreme Courtship. Alinsky) organized several hundred Corsican cutthroats to murder over 3000 Parisians, only a handful of whom were even "aristos," with their blood pooling knee-deep on the Rue de la Seine, in the opening act of the terror. The angle this expose raises in my mind is the apparent deterioration of the quality of undergraduate prose over the past 30 years. These thugs even butchered the Princess de Lamballe, an innocent 16 year old kid who had initially fled to England, but returned out of loyalty to Marie-Antoinette. While Roberts was obviously a prize-winning top undergrad at a top institution, it seems that the brilliance of his history-writing shines more dazzlingly from today's vantage point than it did at the time it was composed. Perhaps some day one of us will convince the others of something. Luker, I am the least right wing of anyone you will find. Instead I am anti-big-government, regardless of what it is called. She was raped over 30 times before being killed by a pike thrust, then raped dozens of time more, by some real upstanding guys, before being dismembered. Thomas Paine was an embarassment, except for one successful pamphlet. But please do not assume that he is one to everyone. Christine does the world of journalism justice by leaving speculation as to the partisan leanings of Roberts to the wonks and players in the sport of political spectating, focusing solely on its academic merit. I need not tell you that Bush is damned near as big-government-oriented as Kerry, so the last one was a Hobson's choice for me. But of the big government types, the ideological leftists kill the most people, by far, and that is what most concerns me. The 21st century issue I pursue is simple fairness. Yes, I use online encyclopaediae, as quite clearly do you. I believe that the founding fathers advocating a war for independence is anything but comparable to the comments of Marxists such as Mr. Perhaps you were not aware that he failed even as a soldier in the revolution (cowardice, I understand), or that, following his "assistance" to the Americans, he lent his polemical talents to the gang of butchers who brought us the French revolution, even justifying "Bloody September" 1792, when Marat (a prototype for Mr. Perhaps you were unaware that Thomas Paine was not a founding father, only spent 4 years here, and failed at everything he did in his whole life except "Common Sense," beginning with his expulsion from school at age 12. It is a fast way to verify and excerpt factual information. Alinsky advocating that we liquidate his neighbors, oops, pardon me, I mean "middle class", and steal their property. Are you somehow implying that becuase this information comes from an encyclopaedia, it is incorrect, or is your argument hinged entirely upon the citation from Mr. I noted earlier that his incendiary pronouncements were not even terribly original-he paraphrased Trotsky and to a lesser degree Lenin in many of them.
Nov 22, 2016. If I told myself last year or any year in the past really that I would be spending my senior year of college conducting independent research and writing a long very, very long research paper, I would have been simultaneou. I first arrived at Harvard College Observatory just over fifty years ago. In 1933 on a trip to Germany, she met the Russian astronomer Sergei Gaposchkin, whose political beliefs made him an exile of his native land and whose Russian nationality made him unwelcome in Hitler’s Germany. I was a very green undergraduate, a summer assistant for Dr. Payne convinced Shapley to give the Russian astronomer a position at Harvard, thereby securing his physical safety as well as his career. The Gaposchkins had three children, all of whom worked as astronomers for a period of time. Shapley—that’s how the entire staff referred to him—and I had an office across from his in Building D. G.—that’s what everyone called Cecilia Payne-Gaposchkin—seemed a formidable, rather remote presence, “of imposing stature and stormy personality” as Jesse Greenstein characterized her.1 I can’t remember where she sat, but Sergei—that’s how we all referred to her feisty husband—had his office on the stairs up to the 15″ telescope, and the graduate students assumed that their two offices were widely separated to keep the stormy personalities from asserting themselves too conspicuously. Payne-Gaposchkin was a many-sided personality known for her wit, her literary knowledge, and for her personal friendships with individual stars. Those initial impressions seem curiously at odds with my later memories, for though Mrs. was always formidable in both intellect and stature, she soon struck me as gentle and kind. She became the first woman in the history of Harvard University to receive a corporation appointment with tenure, and the first woman department chair in 1956. Our paths came together in my first semester in graduate school, when I enrolled in her “Introduction to Observational Astrophysics.” She taught the course in Byerly Hall in the Radcliffe Yard, where all the astronomy classes open to undergraduates then met. David De Vorkin, Henry Norris Russell, Dean of American Astronomers (Princeton, 2000), p. A September 1956 article in The Christian Register published by the American Unitarian Association, announced her appointment and described her as a member of the denomination’s First Parish and Church in Lexington, Massachusetts. This is where I really learned what “chain smoking” was. Payne to Margaret Harwood, 9 January 1925, Schlesinger Library, Radcliffe Institute, Harvard University. Russell to Payne, 14 January 1925, Henry Norris Russell Papers, Series I: Outgoing Correspondence, Box 9, Folder 37; published with permission of the Seeley G. The article also gave an account of her close collaboration with her husband and their respective interests, hers in variable stars and his in eclipsing stars: “When we come to an eclipsing star, I would say to my husband, ‘That is yours.’ And when we would come to a pulsating star, I would say, ‘That is mine.'” Payne-Gaposchkin remained chair of the Astronomy department and a full professor at Harvard for ten years. A pack of cigarettes and a single match could get her through the entire period. During that time, she published The Galactic Novae (1957) in which she noted patterns in observations of stars that had been made over a period of twenty-five years and pointed out areas worthy of further attention. Basically hers was a course about stellar spectroscopy. Payne, Stellar Atmospheres (Harvard Observatory Monograph No. Her book, An Introduction to Astronomy (1954) was based on the undergraduate astronomy course she taught at Harvard College.
May 19, 2017. BOSTON — While other Harvard University students were writing papers for their senior theses, Obasi Shaw was busy rapping his. Shaw is the first student in. Sophal Ear Department of Political Science University of California, Berkeley Ronald E. Mc Nair Scholar Academic Achievement Division E-mail: sophal@csua.URL: May 1995 ACKNOWLEDGMENTS CHAPTER 1: INTRODUCTION CHAPTER 2: ROMANTICIZING THE KHMER REVOLUTION CHAPTER 3: THE CHOMSKY-LACOUTURE CONTROVERSY CHAPTER 4: BEYOND THE STAV CHAPTER 5: CONCLUSION BIBLIOGRAPHY There can be no doubt but that this thesis would not have been possible without the contributions of the following people. I am delighted to acknowledge their contributions to this thesis. For help in the early research phase of this thesis, I would like to thank Professor Ben Kiernan of Yale University, Professor Laura Summers of the University of Hull, and University of California Indochina Archive Director Douglas Pike. For research suggestions, materials, and references, I am eternally grateful to Professor David P. Chandler of Monash University and my dear friend Bruce Sharp. They were both always ready to help, and only an e-mail away. I am especially grateful to archivist Steve Denney of the Indochina Archive for showing me the Cambodian vault and referring me to the Chomsky-Lacouture Controversy over a year ago.
Apr 1, 2016. On Harvard's campus during late March and early April, one word strikes both fear and excitement in the hearts of both juniors and seniors alike the thesis. A senior thesis is a project taken on by undergraduates during their senior year of college and serves as an in depth research paper that almost serves. Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Established in 1636 and named for clergyman John Harvard (its first benefactor), its history, influence, and wealth have made it one of the world's most prestigious universities. and the Harvard Corporation is its first chartered corporation. Although never formally affiliated with any denomination, the early College primarily trained Congregational and Unitarian clergy. Its curriculum and student body were gradually secularized during the 18th century, and by the 19th century, Harvard had emerged as the central cultural establishment among Boston elites. Following the American Civil War, President Charles W. Eliot's long tenure (1869–1909) transformed the college and affiliated professional schools into a modern research university; Harvard was a founding member of the Association of American Universities in 1900. Lawrence Lowell, who followed Eliot, further reformed the undergraduate curriculum and undertook aggressive expansion of Harvard's land holdings and physical plant. James Bryant Conant led the university through the Great Depression and World War II and began to reform the curriculum and liberalize admissions after the war.
Sample Thesis Pages revised January 2015 The Graduate College. grad.illinois.edu/thesis-dissertation Letter from the Dean The mission and the work of the Harvard University Graduate School of Design oscillates between knowledge construction and societal relevance. As it unfolds, this negotiation produces its own themes and variations in emphasis between the two areas.
A full template and example to help you write a citation for a Dissertation in the Harvard style. APPLICANT, YOUNGEST--The admissions office reports that every so often they receive letters from eight-year-old toddlers asking "permission" to come to Harvard. Children write these letters and ask their parents to send them off to the proper address. Last year during Commencement season, a woman accompanying her husband to his tenth class reunion at Harvard became so enamored of the place that she decided the school would be ideal for her child. Marching into the admissions office, she asked for an application for her child. In the course of a brief conversation with the excited woman, William R. Fitzsimmons, director of admissions, asked whether the applicant was male or female. "I don't know yet," the pregnant woman finally muttered. BUILDINGS, VERITABLE VERITAS--Not a single Harvard building now stands in its original 17th century state. Stoughton College, Harvard's last 17th century building, was subject to colonial wartime neglect, and in 1781 it was scrapped. COEDUCATION--The first steps toward coeducation at Harvard were taken out of necessity, not out of social or political principle.
Theses From Previous Years As you think about writing a thesis in Government, or commence your research on your thesis, you may wonder what a successful thesis looks like. We have collected some theses from previous years on this page; please peruse them and use them as examples of how to structure your own. Obasi Shaw, a Harvard undergraduate student became the first in the university's history to submit his thesis in the form of a rap album - and ended up getting an A-, the second highest grade. PHOTO: Harvard University/Facebook A Harvard undergraduate student will be graduating with honours after submitting a 10-track rap album for his final thesis — the first to do so in the history of the university. While other students were busy writing thesis, Obasi Shaw took a bold step and submitted his thesis in the form of a rap album. Shaw became the first in the university’s history to submit his thesis in the form of a rap album and ended up getting an A-, the second highest grade. Stanford University accepts Muslim student who wrote #Black Lives Matter 100 times in admissions essay The 21-year-old’s rap album titled ‘Liminal Minds’ combines “elements of Middle English poetry with issues of racial identity in America.” The English department at Harvard often receives creative thesis such as novels, collection of poems and screenplays. However, a rap album had been submitted for the first time. Obasi Shaw '17 submitted Harvard's first rap thesis, "Liminal Minds," which combines elements of Middle English poetry with issues of racial identity in America. “[African-Americans are] free, but the effects of slavery still exist," says Shaw.
Bernstein's Senior Thesis At Harvard The Roots of a Lifelong Search to. Discover an American Identity1. Geoffrey Block. Sometime in March 1939 Leonard Bernstein, then a Harvard University senior, wrote a letter to his former piano teacher and future secretarial assistant Helen Coates on. Stillman Infirmary letterhead.2. Rodham, Wellesley College class of 1969, has been speculated about, spun, analyzed, debated, criticized and defended. But rarely has it been read, because for the eight years of Bill Clinton’s presidency it was locked away. As forbidden fruit, the writings of a 21-year-old college senior, examining the tactics of radical community organizer Saul D. Alinsky, have gained mythic status among her critics — a “Rosetta Stone,” in the words of one, that would allow readers to decode the thinking of the former first lady and 2008 presidential candidate. Despite the fervent interest in the thesis, few realize that it is no longer kept under lock and key.
If your secondary field is EAS, follow the guidelines of the primary field, but consult with the EAS Director of Undergraduate Studies, and your EAS TF if available. To the extent possible, we will endeavor to provide a teaching fellow affiliated with the EAS program to help you prepare the thesis. The Director of Undergraduate. Doctoral dissertation / master's thesis title: Investigating oral presentation skills and non-verbal communication techniques in UAE classrooms: A thesis in teaching English to speakers of other languages Citations are placed in the context of discussion using the author’s last name and date of publication. (Sabbagh, 2009) Alternatively, you can integrate the citation into the sentence by means of narrative. Sabbagh (2009) compares a variety of oral presentation techniques.
Every year, approximately 45%-55% of senior History concentrators choose to cap their Harvard careers by writing a senior honors thesis. The deadline for fall 2018 applications is December 15, 2017. Please check the Harvard Graduate School of Arts and Sciences (GSAS) website for Prospective Students for more information on admissions and financial aid. All applications and supporting materials must be submitted online before p.m. To apply for admissions and financial aid, or for additional information on admissions requirements for the Ph D program in pure mathematics, please go to the appropriate Graduate School of Arts and Sciences web site listed below. All other inquires may be directed to the Graduate Program Administrator of the Mathematics Department. Here are the addresses and links: The statement of purpose for graduate applications is carefully weighted by the admissions committee. The applicant's statement should convince the committee that he or she is able to communicate effectively and with a deep understanding of mathematics. It is not intended to be a biographical sketch or a reflection on one's decision to enter the field. Letter writers should be faculty or others qualified to evaluate the applicant's potential for graduate study in mathematics. The letters must be submitted online and by the application deadline. Applicants should include any research papers, publications, and other original works they would like to have evaluated by the admissions committee.
Harvard College Prizes by Category For prizes marked with an asterisk *. John Dunlop Undergraduate Thesis Prize in Business and Government. Harvard History Use the following template to cite a dissertation using the Harvard citation style. For help with other source types, like books, PDFs, or websites, check out our other guides. To have your reference list or bibliography automatically made for you, try our free citation generator.