Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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