Cited: "How They Work: PEM Fuel Cells." Fuel Economy. Web. 24 Jan. 2010. . "Hydrogen Production." US Department of Energy. Web. 24 Jan. 2010. . "Hydrogen Fuel Cells." US Department of Energy. Web. 24 Jan. 2010. .
Cited: "How They Work: PEM Fuel Cells." Fuel Economy. Web. 24 Jan. 2010. . "Hydrogen Production." US Department of Energy. Web. 24 Jan. 2010. . "Hydrogen Fuel Cells." US Department of Energy. Web. 24 Jan. 2010. .