How do I cite a book in MLA format?

Answer

MLA Citation for books follows this format:

Author Last Name, First Name. Title of Book. Publisher, Publication date.

Example:

Gladwell, Malcolm. The Tipping Point: How Little Things Can Make a Big Difference. Little Brown, 2000.

italicize the title
Use "title case"; capitalize all words in title except for prepositions (to, from, etc) and article (the, a, an).
include any sub-titles after a colon :
City of publication no longer necessary in MLA 9th edition (*except books published before 1900)

For more on citing books in MLA format, visit Purdue OWL here.