APA (7th ed.) Citation

Asimov, I. (1983). Counting the eons. Doubleday.

Chicago Style (17th ed.) Citation

Asimov, Isaac. Counting the Eons. Garden City, N.Y.: Doubleday, 1983.

MLA (9th ed.) Citation

Asimov, Isaac. Counting the Eons. Doubleday, 1983.