Cita APA (7th ed.)

Steinbeck, J. (2002). Grapes of wrath. Penguin.

Cita Chicago (17th ed.)

Steinbeck, John. Grapes of Wrath. New York: Penguin, 2002.

Cita MLA (9th ed.)

Steinbeck, John. Grapes of Wrath. Penguin, 2002.