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<http://www.precor.com/products/en/956i-treadmill>.
Johansen, Glen R. "Questions." Message to the author. 26 Mar. 2012. E-mail.
"North Carolina." Institute for Energy Research. Institute for Energy Research. Web. 01 Apr. 2012. <http://www.instituteforenergyresearch.org/states/north-carolina>.
"Phone Call with Woodway." Telephone interview. 28 Mar. 2012.
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<http://www.woodway.com/woodway_difference.html>.
StairMaster. StepMill 7000 Owner's Manuel. 2001. Kirkland, Washington.
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"WOODWAY EcoMill Manual Treadmill." WOODWAY USA, Inc. 2012. Web. 01 Apr. 2012.
<http://www.woodway.com/fitness/ecomill.html>.
Picture Sources
"HOW IT WORKS." ReRev. Web. 29 Apr. 2012. <http://www.rerev.com/howitworks.html>.
"WOODWAY EcoMill Manual Treadmill." WOODWAY USA, Inc. 2012. Web. 01 Apr. 2012.
<http://www.woodway.com/fitness/ecomill.html>.
Video Sources
ReRev Renewable Energy. "ReRev.com on CNN." YouTube. 8 Sept. 2011. Web. 29 Apr. 2012.
<http://www.youtube.com/watch?v=7ri-K0tib30>.
Woodway Treadmills. "How to Use the EcoMill Manual Treadmill." YouTube. 15 Feb. 2012. Web. 29 Apr. 2012. <http://www.youtube.com/watch?v=0yPkrkn0Wk0>.