Doherty, Craig A., and . "Hoover Dam Statistics." Hoover Dam Tour Company. 2007. ProTech Communications, Inc., Web. 15 Oct 2009. <http://www.hooverdamtourcompany.com/biblio.html>.
Lovgren, Stefan. "Warming to Cause Catastrophic Rise in Sea Level?." National Geographic News. 26 Apr 2004. National Geographic Society, Web. 15 Oct 2009. <http://news.nationalgeographic.com/news/2004/04/0420_040420_earthday.html>.
Nation Resources Defense Council. "Global Warming Puts the Arctic on Thin Ice." 22 Nov 2005. National Resources Defense Council, Web. 23 Oct 2009. <http://www.nrdc.org/globalwarming/qthinice.asp>
Perlman, Howard. "Water Science for Schools." USGS Science for a Changing World. 13 May 2009. U.S Department of the Interior, Web. 15 Oct 2009. <http://ga.water.usgs.gov/edu/earthglacier.html>.
Stanford SOLAR Center. "Global Warming." 2008. Stanford SOLAR Cente, Web.. 23 Oct 2009 <http://solar-center.stanford.edu/sun-on-earth/glob-warm.html>
Stoft, Steve. "Effects of the more Rapid Melting of the Polar Caps." Polar Ice Cap Melting. 01 Jan 2007. zFacts, Web. 15 Oct 2009. <http://zfacts.com/p/222.htmlPo>.