APA (7th ed.) Citation

Sagan & Leonard. (1972). Planets. Time-Life Books.

Chicago Style (17th ed.) Citation

Sagan and Leonard. Planets. Hong Kong: Time-Life Books, 1972.

MLA (8th ed.) Citation

Sagan and Leonard. Planets. Time-Life Books, 1972.

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