1. Solar Photovoltaic Industry: Looking through the Storm;O Rouke,2009
2. Solarbuzz.com: Solar Electricity Price Index. http://www.solarbuzz.com/SolarPrices.htm.
3. U.S. Department of Energy, Energy Information Administration: Average Retail Price of Electricity to Ultimate Customers by End-Use Sector and by State. http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_b.html.
4. First Solar: 2008 Annual Report. http://investor.firstsolar.com/.
5. Solar energy conversion toward 1 TW;Ginley;MRS Bull,2008