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"City of Boulder, Colorado." City of Boulder, Colorado. City of Boulder, 22 Jan. 2013. Web. 03 Feb. 2013. <http://www.bouldercolorado.gov/index.php?option=com_content>.
Hurst, Randolph W. "Hydro Electricity Explained." Hydro Electricity. Electricity Today Magazine, n.d. Web. 01 Feb. 2013
The EPA. "Hydroelectricity." EPA. Environmental Protection Agency, 17 Oct. 2012. Web. 03 Feb. 2013. <http://ga.water.usgs.gov/edu/hydroadvantages.html>.
Gravals, Simon. "Take Action." Hydroelectricity Explained. Energy Saving Trust, n.d. Web. 03 Feb. 2013.
"Hydroelectric Energy." - National Geographic Education. The National Geographic Society, n.d. Web. 03 Feb. 2013.
"City of Boulder, Colorado." City of Boulder, Colorado. City of Boulder, 22 Jan. 2013. Web. 03 Feb. 2013. <http://www.bouldercolorado.gov/index.php?option=com_content>.