APA (7th ed.) Citation

Silverberg, R. (1999). The Alien Years (1. pbk print.). HarperPrism.

Chicago Style (17th ed.) Citation

Silverberg, Robert. The Alien Years. 1. pbk print. New York: HarperPrism, 1999.

MLA (9th ed.) Citation

Silverberg, Robert. The Alien Years. 1. pbk print. HarperPrism, 1999.

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