APA (7th ed.) Citation

Sagan, C., & Oyster, D. F. (2009). Cosmos. Ringier.

Chicago Style (17th ed.) Citation

Sagan, Carl, and David F. Oyster. Cosmos. [Bratislava: Ringier, 2009.

MLA (9th ed.) Citation

Sagan, Carl, and David F. Oyster. Cosmos. Ringier, 2009.

Warning: These citations may not always be 100% accurate.