APA (7th ed.) Citation

Leonard, C. S. ;. J. N. (1972). Planets. Time-Life International.

Chicago Style (17th ed.) Citation

Leonard, Carl Sagan ; Jonathan Norton. Planets. Time-Life International, 1972.

MLA (8th ed.) Citation

Leonard, Carl Sagan ; Jonathan Norton. Planets. Time-Life International, 1972.

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