Cita APA (7a ed.)

Bellow, S. (1996). Humboldt's gift. Penguin Books.

Cita Chicago Style (17a ed.)

Bellow, Saul. Humboldt's Gift. New York [etc.]: Penguin Books, 1996.

Cita MLA (9a ed.)

Bellow, Saul. Humboldt's Gift. Penguin Books, 1996.