The source you are citing may include the important work of other people besides the author. For example, the source may have an editor, performer, or translator you need to include in the citation.
The MLA Handbook dictates that when crediting other contributors' work in a citation, you should include a description of their role. Below are some common role descriptions:
Eggers, Dave. "The Man at the River." The Best American Essays 2014, edited by Robert Atwan, Houghton, 2014, pp. 150-61.
The Wizard of Oz. Directed by Victor Fleming, performance by Judy Garland, Metro-Goldwyn-Mayer, 25 Aug. 1939.
Ronson, Mark. "Uptown Funk." Uptown Special, performance by Bruno Mars, RCA 10 Nov. 2014.
Krausz, Tamas. Reconstructing Lenin: An Intellectual Biography. Translated by Balint Bethlenfalvy and and Mario Fenyo, Monthly Review Press, 2015.
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