- Elementary Energy Infobook, Manassas,VA ,2003-2004
- U.S energy imformation administrasion, Geothermal Energy, http://tonto.eia.doe.gov/kids/energy.cfm?page=geothermal_home-basics
- World Book inc., Geothermal Energy, World book G.8, chicago.IL, 2005
- Graham, Ian ,Energy Forever? Geothermal and Bio-energy, Autin, New York, Raintree Steck-Vanghn Publisher, 1999
Felicia's Geothermal Energy Research Biography!
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