APA (7th ed.) Citation

Asimov, I., Wu, W. F., & Cover, A. B. (2000). Isaac Asimov's robot city. iBooks.

Chicago Style (17th ed.) Citation

Asimov, Isaac, William F. Wu, and Arthur Byron Cover. Isaac Asimov's Robot City. New York: iBooks, 2000.

MLA (8th ed.) Citation

Asimov, Isaac, et al. Isaac Asimov's Robot City. iBooks, 2000.

Warning: These citations may not always be 100% accurate.