APA (7th ed.) Citation

Sagan, C., & Leonard, J. N. (1969). Planets. Time-Life Books.

Chicago Style (17th ed.) Citation

Sagan, Carl, and Jonathan Norton Leonard. Planets. New York: Time-Life Books, 1969.

MLA (9th ed.) Citation

Sagan, Carl, and Jonathan Norton Leonard. Planets. Time-Life Books, 1969.

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