1. Bird, L., Dagher, L., Swezey, B., 2007. Green Power Marketing in the United States: A Status Report, 10th ed., NREL/TP-620-42502. National Renewable Energy Laboratory, Golden, CO, December 〈http://www.eere.energy.gov/greenpower/resources/pdfs/42502.pdf〉.
2. Blank, E., Bird, L., Swezey, B., 2002. A certificate-based approach to marketing green power and constructing new wind energy facilities. Conference paper prepared for Windpower 2002, Portland, OR, June 2–5, 2002. 〈http://www.eere.energy.gov/greenpower/resources/pdfs/0602_newwind_cert.pdf〉.
3. Hanson, C., 2005. The business case for using renewable energy, The World Resources Institute's Corporate Guide to Green Power Markets. Installment 7, December.
4. Clearing the air: the impact of carbon cap and trade regulations on renewable Energy. SOLAR 2006 Conference Proceedings;Harmon,2006
5. Holt, E., Wiser, R., 1999. Understanding consumer demand for green power. Report prepared for the National Wind Coordinating Committee. 〈http://www.nationalwind.org/publications/green_power.htm〉.