APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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