NOTE: MLA recently released the 7th edition of the MLA Handbook for Writers of Research Papers. There are several significant changes to the MLA format in the new edition. See a quick list here. (3/25/09)
MLA Style Manual and Guide to Scholarly Publishing, 3rd edition. Joseph Gibaldi. (1998)
This is the official version of MLA style for graduate students, scholars, or other authors preparing manuscripts for publication. (Ask at the Reference Desk.)
MLA Handbook for Writers of Research Papers, 7th edition. Joseph Gibaldi. (2009)
This is the official student version of the MLA Style Manual–for high school and undergraduate college students. (Ask at the Reference Desk.)
www.dianahacker.com – The Diana Hacker website gives examples of in-text and bibliographic citations in MLA, APA, Chicago, and CSE formats. Also included is information on manuscript format, finding sources, and sample papers. This is a fantastic resource–librarian recommended!
Style Manuals and Guides to Research and Writing – California State University at Sacramento
Another excellent resource which includes information on parenthetical citations, endnotes and footnotes, and paper formatting.