Steinbeck, J. (2006). The Grapes of wrath. New York: Penguin Books.
Chicago Style aipamenaSteinbeck, John. The Grapes of Wrath. New York: Penguin Books, 2006.
MLA aipamenaSteinbeck, John. The Grapes of Wrath. New York: Penguin Books, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.