APA (7th ed.) Citation

Steinbeck, J. (1939). The grapes of wrath. The Viking press.

Chicago Style (17th ed.) Citation

Steinbeck, John. The Grapes of Wrath. New York: The Viking press, 1939.

MLA (8th ed.) Citation

Steinbeck, John. The Grapes of Wrath. The Viking press, 1939.