APA (7th ed.) Citation

Asimov, I., & Asimov, J. (2002). It's been a good life. Prometheus Books.

Chicago Style (17th ed.) Citation

Asimov, Isaac, and Janet Asimov. It's Been a Good Life. Amherst, N.Y.: Prometheus Books, 2002.

MLA (9th ed.) Citation

Asimov, Isaac, and Janet Asimov. It's Been a Good Life. Prometheus Books, 2002.