Cita APA (7th ed.)
Steinbeck, J. (1972). The grapes of wrath. Viking Press.
Cita Chicago (17th ed.)
Steinbeck, John. The Grapes of Wrath. New York, N.Y.: Viking Press, 1972.
Cita MLA (9th ed.)
Steinbeck, John. The Grapes of Wrath. Viking Press, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.