"Kepler, Johannes," Microsoft Encarta 96 Encyclopedia (c) 1993-1995, Microsoft Corporation.
Drennon, Bill. "Kepler's Law with Animation"; http://www.cvc.org/science/kepler.htm
Fowler, Michael. "Johannes Kepler"; http://phys.virginia.edu/classes/109N/1995/lectures/kepler.html
Guidry, Mike. "Johannes Kepler: Laws of Planetary Motion"; http://csep10.phys.utk.edu/astr161/lect/history/kepler.html
Koestler, Arthur. (1959). The Watershed. New York: MacMillan Co.
Ronan, Colin. (1969). Edmond Halley, Genius in Eclipse. New York: Doubleday & Co.
Sagan, Carl & Druyan, Ann. (1997). Comet. New York: Ballantine Books.
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Last Updated November 24, 1997 by Desmond H. O'Neill.