The final authority for MLA format is the Modern Language Association as published in its MLA Handbook. The final authority for the bibliographic form used in your paper is your professor.
Angelou, Maya. Wouldn't Take Nothing for My Journey Now. New York: Random, 1993.
MacCannell, Julie Flower. "On Woman's Speech." American Journal of Psychoanalysis 54.2 (1994): 143-148.
Walker, Pierre A. "Racial Protest, Identity, Words,
and Form in Maya Angelou's I Know Why the Caged Bird Sings."
College Literature 22.3 (1995): 91-109. Academic Search Premier.
EBSCO. Goshen College Good Library. 9 Oct. 2001.
Richardson, Lynda. "At 73, a Robust 'People's Poet' Embraces the Prosaic." New York Times 1 Feb. 2002: B6.
Kindred Spirits: Contemporary African-American Artists. Dir. Christine McConnell. Videocassette. North Texas Public Broadcasting, Inc., 1992.
Bloom, Lynn Z. "Maya Angelou." In Afro-American Writers After 1955: Dramatists and Prose Writers. Ed. Thadious M. Davis & Trudier Harris. Detroit: Gale, 1985. Vol. 38 of Dictionary of Literary Biography. 3-12.
Neubauer, Carol E. "Maya Angelou: Self and a Song of Freedom in the Southern Tradition." Southern Women Writers: The New Generation. Ed. Tonette Bond Inge. Tuscaloosa: U of Alabama P, 1990. 114-42. In Contemporary Literary Criticism. Ed. James P. Draper. Detroit: Gale, 1993. Vol. 77. 130-131.
Dr. Maya Angelou: The Official Website. 2001. 9 Oct. 2001<http://www.mayaangelou.com/>.
There are a number of WWW links to help with MLA documentation style. Try these:
Gibaldi, Joseph. MLA Handbook for Writers of Research Papers. 6th ed. New York: Modern Language Association, 2003. (Ref LB 2369.G53 2003)
Keene, Michael L and Katharine H. Adams. Easy Access. New York: McGraw Hill, 2006. (Ref PE1408 .K425 2006)