APA (7th ed.) Citation

Asimov, I., Leigh, S., & Scotten, C. (2001). Robots and aliens 1. ibooks.

Chicago Style (17th ed.) Citation

Asimov, Isaac, Stephen Leigh, and Cordell Scotten. Robots and Aliens 1. New York: ibooks, 2001.

MLA (8th ed.) Citation

Asimov, Isaac, et al. Robots and Aliens 1. ibooks, 2001.