Collected plays.
Edited by Ralph Manheim and John Willett.

APA Citation

Brecht, B., Willett, J., Manheim, R. (1971). Collected plays. [1st American ed.] New York: Vintage Books.

MLA Citation

Brecht, Bertolt, 1898-1956, John Willett, and Ralph Manheim. Collected Plays. [1st American ed.] New York: Vintage Books, 1971.

Warning: These citations may not always be complete (especially for serials).