Cita APA (7th ed.)

Asimov, I. (1983). The caves of steel (1st Ballantine books ed.). Ballantine Books.

Cita Chicago (17th ed.)

Asimov, Isaac. The Caves of Steel. 1st Ballantine books ed. New York: Ballantine Books, 1983.

Cita MLA (8th ed.)

Asimov, Isaac. The Caves of Steel. 1st Ballantine books ed. Ballantine Books, 1983.