APA (7th ed.) Citation

Sagan, C. (1980). The Cosmic connection: An extraterrestrial perspective. Doubleday.

Chicago Style (17th ed.) Citation

Sagan, Carl. The Cosmic Connection: An Extraterrestrial Perspective. New York: Doubleday, 1980.

MLA (9th ed.) Citation

Sagan, Carl. The Cosmic Connection: An Extraterrestrial Perspective. Doubleday, 1980.

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