APA (7th ed.) Citation

Littmann, M. (2004). Planets beyond: Discovering the outer solar system. Dover Publications.

Chicago Style (17th ed.) Citation

Littmann, Mark. Planets Beyond: Discovering the Outer Solar System. Mineola, N.Y: Dover Publications, 2004.

MLA (9th ed.) Citation

Littmann, Mark. Planets Beyond: Discovering the Outer Solar System. Dover Publications, 2004.

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