Cita APA (7th ed.)

Steinbeck, J. (1973). The Grapes of Wrath. Penguin Books.

Cita Chicago (17th ed.)

Steinbeck, John. The Grapes of Wrath. Gran Bretaña: Penguin Books, 1973.

Cita MLA (9th ed.)

Steinbeck, John. The Grapes of Wrath. Penguin Books, 1973.