Cita APA (7a ed.)

Steinbeck, J. (1981). Once there Was a War. Penguin.

Cita Chicago Style (17a ed.)

Steinbeck, John. Once There Was a War. Harmondsworth: Penguin, 1981.

Cita MLA (9a ed.)

Steinbeck, John. Once There Was a War. Penguin, 1981.