Where can I find a good MLA citation guide?

St. Martin's Handbook edition 6e (the 2009 edition) contains the most up to date information on MLA in text and bibliographical information. St. Martin's is written to EAE (Edited American English) and is recommended by multiple universities. St. Martin's also features APA and a brief overview of Chicago style. You can order it on Amazon.com and probably on e-bay too.