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ENVIRONMENTAL IMPACTS FROM SNOWMOBILE USE. (2014, May 1). Retrieved February 2, 2015, from http://winterwildlands.org/wp- content/uploads/2014/05/Environmental-Impacts-from-Snowmobile-Use.pdf
"Is a Dirt Bike Bad for the Environment?" Home Guides. N.p., n.d. Web. 04 Mar. 2015.
Keweenaw Research Center / Michigan Technological University. SAE Clean Snowmobile Challenge. Retrieved March 1, 2015, from http://www.mtukrc.org/snowmobile.htm
Kupperman, Stacy, Chad Ryan, and Anthony Turi. "Personal Watercraft: Safety and Environmental Impact." Http://www.uvm.edu/. University of Vermont, n.d. Web. 3 Mar. 2015.
"Motocross Action Magazine | EPA TO FOCUS ON DIRT BIKES — SEPT 19."Motocross Action Magazine. N.p., n.d. Web. 20 Apr. 2015
Newman, L., & Sears, J. (2008). Snowmobile impact on Natural Environment. Vermont Legislative Research Shop, 1-4. Retrieved February 2, 2015, from http://www.uvm.edu/~vlrs/Environment/snowmobilesenvironmentalimpact.pdf
"RANGER® EV." 2015 Polaris RANGER EV Avalanche Gray : Features. N.p., n.d. Web. 04 Feb. 2015.
Richens, V., & Larvigne, G. (1978). Response of white-tailed deer to snowmobiles and snowmobile trails in Maine. 337.
"2 Stroke and 4 Stroke Engines." 2 Stroke and 4 Stroke Engines. N.p., n.d. Web. 02 Feb. 2015.
Trippi, P. (2015, March 1). Email Interview.
Snow and Efficiency. (2013). Retrieved From http://www.snow-
efficiency.com/2/home/
Prinoth Snow Groomers and Machines. (2014). Retrieved From
http://en.prinoth.com
Wikipedia. Wikimedia Foundation, n.d. Web. 20 Apr. 2015