1. "Galilei, Galileo (1564-1642)." World of Earth Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Vol. 1. Detroit: Gale, 2003. 243-245. Gale Virtual Reference Library. Web. 1 Oct. 2010.
2. Hightower, Paul. Galileo: Astronomer and Physicist. Springfield, NJ, USA: Enslow, 1997. Print.
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