Goldsmith, Donald & Owen, Tobias. The Search for Life in the Universe, 3rd Edition. Sausalito: University Science Books, 2001.
Rothery, David A. Satellites of the Outer Planets: Worlds in their own right, 2nd Edition. New York: Oxford University Press, 1999.
Spilker, Linda J. Ed. Passage to a Ringed World: The Cassini-Huygens Mission to Saturn and Titan. Washington D.C.: National Aeronautics and Space Administration, 1997.