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Sources

• Edmunds, Dan. "SmartWay: The EPA's Green Vehicle Ratings Program." Edmunds.com. May 1, 2007. (March 22, 2009) http://www.edmunds.com/advice/fueleconomy/articles/120590/article.html
• United States Environmental Protection Agency. "Green Vehicle Guide: About the Ratings." March 26, 2009. (March 26, 2009) http://www.epa.gov/greenvehicles/Aboutratings.do
• United States Environmental Protection Agency. "SmartWay Certified." Dec. 12, 2008. (March 22, 2009) http://www.epa.gov/smartway/vehicles/smartway-certified.htm