Cita APA

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

Citación estilo Chicago

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

Cita MLA

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