Cita APA (7a ed.)

Steinbeck, J. (1933). The grapes of wrath. Penguin Books.

Cita Chicago Style (17a ed.)

Steinbeck, John. The Grapes of Wrath. Inglaterra: Penguin Books, 1933.

Cita MLA (9a ed.)

Steinbeck, John. The Grapes of Wrath. Penguin Books, 1933.