Cita APA (7a ed.)

Sagan, C. (1973). The cosmic connection: An extraterrestrial perspective. Dell.

Cita Chicago Style (17a ed.)

Sagan, Carl. The Cosmic Connection: An Extraterrestrial Perspective. New York: Dell, 1973.

Cita MLA (9a ed.)

Sagan, Carl. The Cosmic Connection: An Extraterrestrial Perspective. Dell, 1973.