A citation is a brief reference to a specific information source such as a book, a journal article, or a website, which acknowledges an original idea expressed therein and provides a means of locating the original source. In general, a citation includes both a notation in the body of a text and an entry in a list of sources following the text.
A citation style is a set of guidelines for formatting and organizing citations. Although there exist many different citation styles to suit different purposes, most academic research papers adhere to one of three major styles: American Psychological Association (APA), Chicago, or Modern Language Association (MLA).
Use the style recommended or required by your instructor. If your instructor does not specify a style, choose one based on the discipline or field about which you are writing:
The Publication Manual of the American Psychological Association, Seventh Edition, is the official source for APA Style. With millions of copies sold worldwide in multiple languages, it is the style manual of choice for writers, researchers, editors, students, and educators in the social and behavioral sciences, natural sciences, nursing, communications, education, business, engineering, and other fields.
In the seven years since the previous edition debuted, we have seen an extraordinary evolution in the way we create and share knowledge. This seventeenth edition of The Chicago Manual of Style has been prepared with an eye toward how we find, create, and cite information that readers are as likely to access from their pockets as from a bookshelf.
The ninth edition of the MLA Handbook is a textbook and reference guide that offers student writers and writing instructors guidance on creating works-cited-list entries in MLA style using the template of core elements. It features advice on punctuation, grammar, inclusive language, formatting research papers, and in-text citations. Includes an appendix of sample works-cited-list entries, illustrations, and an index.