Every academic discipline has an associated style. Always check with your Professor which style they require.
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
Chicago Citation Examples (Documentary-Note Style)
More examples of The Chicago Manual of Style (using Ibid, citing indirect sources, etc.)