Sagan, C. (1980). Cosmos. Ballantine Books.
Lua i Stíl Chicago (17ú heag.)Sagan, Carl. Cosmos. New York: Ballantine Books, 1980.
Lua MLA (9ú heag.)Sagan, Carl. Cosmos. Ballantine Books, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.