APA (7th ed.) Citation

Sagan, C. (1983). Cosmos (7a. ed.). Planeta.

Chicago Style (17th ed.) Citation

Sagan, Carl. Cosmos. 7a. ed. Barcelona: Planeta, 1983.

MLA (9th ed.) Citation

Sagan, Carl. Cosmos. 7a. ed. Planeta, 1983.

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