APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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