1. American Solar Energy Society (ASES) and Management Information Services, Inc., 2008. Defining, estimating, and forecasting the renewable energy and energy efficiency industries in the U.S. and in Colorado, Boulder, CO, December 2008.
2. Renewable Energy and Energy Efficiency: Economic Drivers for the 21st Century. Boulder, CO;Bezdek,2007
3. Study of the Effects on Employment of Public Aid to Renewable Energy Sources;Calzada,2009
4. Department of Energy (DOE), 2008. 20% wind energy by 2030: increasing wind energy's contribution to U.S. electricity supply. DOE/GO-102008-2567, U.S. Department of Energy, July 2008.
5. European Wind Energy Association (EWEA), 2009. Wind at Work: Wind Energy and Job Creation in the EU.