APA (7th ed.) Citation

Heinlein, R. A., & Robinson, S. (2006). Variable star. Tor.

Chicago Style (17th ed.) Citation

Heinlein, Robert A., and Spider Robinson. Variable Star. New York: Tor, 2006.

MLA (8th ed.) Citation

Heinlein, Robert A., and Spider Robinson. Variable Star. Tor, 2006.

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