APA (7th ed.) Citation

Asimov, I. (1972). The gods themselves. Fawcett.

Chicago Style (17th ed.) Citation

Asimov, Isaac. The Gods Themselves. Greenwich, Conn: Fawcett, 1972.

MLA (9th ed.) Citation

Asimov, Isaac. The Gods Themselves. Fawcett, 1972.