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Zotero is a free easy to use citation manager tool. ZoteroBib is a quick tool to create a bibliography.
APA Style
The APA Style and Grammar Guidelines provides guidelines for paper format, in-text citations, mechanics of style, bias-free language, tables and figures, references, and grammar.
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.
The Publication Manual of the American Psychological Association, Seventh Edition is the official source for APA Style. 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.