APA (7th ed.) Citation

Sagan, C., & Leonard, J. N. (1967). Planets. Time.

Chicago Style (17th ed.) Citation

Sagan, Carl, and Jonathan Norton Leonard. Planets. Amsterdam: Time, 1967.

MLA (8th ed.) Citation

Sagan, Carl, and Jonathan Norton Leonard. Planets. Time, 1967.

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