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.
Atenció: Aquestes cites poden no estar 100% correctes.