MLA (Modern Language Association) citation style is most commonly used to write papers and cite sources in the liberal arts, literature and other fields in the humanities.
In the 2009 MLA Handbook for Writers of Research Papers (New York: MLA), the MLA recommends the use of a parenthetical system of documentation. With the MLA parenthetical system, you will place citations in parentheses within your text to point to sources in an alphabetized list of works cited that appears at the end of your paper.
Notes--numbered consecutively throughout your paper--may still be used for explanation or comment that the paper itself cannot accommodate.
MLA Style - from the Purdue OWL (Online Wrriting Lab) - Divided into sections so it's easy to find exactly the format you need.
MLA Documentation Style - from the University of Wisconsin - Madison, Writing Center.