APA (7th ed.) Citation

Engdahl, S. L. (2006). Extraterrestrial life. Greenhaven Press.

Chicago Style (17th ed.) Citation

Engdahl, Sylvia Louise. Extraterrestrial Life. Detroit: Greenhaven Press, 2006.

MLA (9th ed.) Citation

Engdahl, Sylvia Louise. Extraterrestrial Life. Greenhaven Press, 2006.

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