Hansen, William. "Ancient Greece." The New Book Of Knowledge. G. 7. Danbury: Grolier inc., 1999. Print.
Weisstein, Eric. "Archimedes of Syracuse{ca. 287-ca.212 bc}." scienceworld.wolfram.com. Mathematica CalcCenter, 2007. Web. 24 Apr 2012. <www.scienceworld.wolfram.com /biography/Archimedes.html>.
"olympian god and goddesses." infoplease.com. part of family education network, 2012. Web. 24 Apr 2012. <www.infoplease.com/ipa/A0881990.html>.