APA (7th ed.) Citation

Gassner, J. (1939). Twenty best plays of the modern American theatre. Crown.

Chicago Style (17th ed.) Citation

Gassner, John. Twenty Best Plays of the Modern American Theatre. New York: Crown, 1939.

MLA (8th ed.) Citation

Gassner, John. Twenty Best Plays of the Modern American Theatre. Crown, 1939.