APA (7th ed.) Citation

Steinbeck John, D., Demott, R., & Steinbeck, J. (2006). The grapes of wrath. Penguin Books.

Chicago Style (17th ed.) Citation

Steinbeck John, Demott, Robert Demott, and John Steinbeck. The Grapes of Wrath. New York: Penguin Books, 2006.

MLA (9th ed.) Citation

Steinbeck John, Demott, et al. The Grapes of Wrath. Penguin Books, 2006.