Cita APA (7th ed.)

Sagan, C. (2013). Cosmos (Ballantine Books Trade Paperbacks, 2013.). Ballantine.

Cita Chicago (17th ed.)

Sagan, Carl. Cosmos. Ballantine Books Trade Paperbacks, 2013. New York: Ballantine, 2013.

Cita MLA (9th ed.)

Sagan, Carl. Cosmos. Ballantine Books Trade Paperbacks, 2013. Ballantine, 2013.