APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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