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Earl, Lieko, and Bethany Sparn. "Choose the Right Advanced Power Strip for You." Energy.gov. U.S. Government, 28 Oct. 2013. Web. 12 May 2014.
Garforth, Peter. "The Problem With Renewable Energy." Renewable Energy. Sustainable Plant, 10 Jan. 2011. Web. 22 Apr. 2014.
Hoffman, Joe. "Potential Health and Environmental Effects of Hydrofracking in the Williston Basin, Montana." Potential Health and Environmental Effects of Hydrofracking in the Williston Basin, Montana. Carleton College, 16 Sept. 2013. Web. 23 Apr. 2014.
"Oil." EPA. Environmental Protection Agency, 13 Sept. 2013. Web. 28 Apr. 2014.
"Sustainable Energy." Wikipedia. Wikimedia Foundation, 28 Apr. 2014. Web. 28 Apr. 2014