APA (7th ed.) Citation

Steinbeck, J. (1975). Viva Zapata!: The original screenplay. Viking Press.

Chicago Style (17th ed.) Citation

Steinbeck, John. Viva Zapata!: The Original Screenplay. New York: Viking Press, 1975.

MLA (8th ed.) Citation

Steinbeck, John. Viva Zapata!: The Original Screenplay. Viking Press, 1975.