APA استشهاد

Steinbeck, J. (1994). Once there was a war. Penguin Books.

استشهاد بنمط شيكاغو

Steinbeck, John. Once There Was a War. London: Penguin Books, 1994.

MLA استشهاد

Steinbeck, John. Once There Was a War. Penguin Books, 1994.