Every academic discipline has an associated style. Always check with your Professor which style they require.
MLA Handbook for Writers of Research Papers
Guide to research, mechanics, format, documentation, citing, abbreviations, etc. for term papers, with sample pages of a research paper in MLA style.
MLA Formatting and Style Guide from The Owl at Purdue (SEVENTH EDITION)
"This resource, [is] updated to reflect the MLA Handbook for Writers of Research Papers (7th ed.) and the MLA Style Manual and Guide to Scholarly Publishing (3rd ed.)" MLA style is commonly used in the Humanities.
MLA How to Guide (PDF)
This guide contains formats and examples for the source types most commonly cited by students.
How to Cite Using MLA - Clarification 2010: Citing Multimedia
Paper Formatting: MLA style (VIDEO)
Learn how to properly format your paper in MLA style in Word.
The Chicago Manual of Style
Chicago style is commonly used in the field of History.
Chicago Citation Examples (Documentary-Note Style)
More examples of The Chicago Manual of Style (using Ibid, citing indirect sources, etc.)
Publication manual of the American Psychological Association.
APA style is often used by scholars in the social and behavioral sciences.
link goes to PDF.