Cita APA (7th ed.)
Steinbeck, J. (1986). The grapes of wrath. Penguin Books.
Cita Chicago (17th ed.)
Steinbeck, John. The Grapes of Wrath. New York, N.Y.: Penguin Books, 1986.
Cita MLA (9th ed.)
Steinbeck, John. The Grapes of Wrath. Penguin Books, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.