APA (7th ed.) Citation

Barlowe, W. D., & Summers, I. (1979). Barlowe's guide to extraterrestrials. Workman Pub..

Chicago Style (17th ed.) Citation

Barlowe, Wayne Douglas, and Ian Summers. Barlowe's Guide to Extraterrestrials. New York: Workman Pub., 1979.

MLA (9th ed.) Citation

Barlowe, Wayne Douglas, and Ian Summers. Barlowe's Guide to Extraterrestrials. Workman Pub., 1979.