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Davis, Katherine. Biography.com. 2002. 7 March 2013 <http://www.biography.com>
"Galileo." Stanford Encyclopedia of Philosophy. 8 March 2013 <http://plato.stanford.edu/>
"Rene Descartes." Internet Encyclopedia of Philosophy. 8 March 2013 <http://www.iep.utm.edu/>
Spielvogel, Jackson J. and the National Geographic Society. Medieval and Early Modern Times. Columbus, Ohio: McGraw-Hill Companies, 2006.
Dictionary.com. 2013. Dictionary.com. 7 March 2013 <http://dictionary.reference.com/>
Yahoo.com. 2013. Yahoo! Inc. 9 March 2013 <http://kids.yahoo.com>