Cita APA (7th ed.)

Asimov, I. (1997). The caves of steel. HarperCollins Publishers.

Cita Chicago (17th ed.)

Asimov, Isaac. The Caves of Steel. London: HarperCollins Publishers, 1997.

Cita MLA (8th ed.)

Asimov, Isaac. The Caves of Steel. HarperCollins Publishers, 1997.