1. Greenhouse gases and air pollutants in the city of Toronto. ICF International. Retrieved January 30, 2009 From Toronto atmospheric fund and Toronto environment office. June 2007.
2. Hydrogen fuel: opportunities and barriers;Kumar;Journal of Fuel Cell Science and Technology,2009
3. Environmental indicators, CO2 emissions;United Nations Statistics Division,2007
4. Hydrogen Journal. 180 miles H2 pipeline connects Louisiana to Texas: October 2010, http://www.h2journal.com/displaynews.php? NewsID=521.
5. The fuel cell vehicle analysis of energy use, emissions and cost;Per;International Journal of Hydrogen Energy,1998