1. U.S. Department of Energy. Installed wind capacity, 2012. Available at: 〈http://www.windpoweringamerica.gov/wind_installed_capacity.asp〉; February 22, 2013.
2. American Wind Energy Association. U.S. wind energy annual market report year ending 2012. Available at: 〈http://awea.rd.net/Resources/Content.aspx?ItemNumber=5344〉; July 10, 2013.
3. Wind power development in the United States;Hitaj;J Environ Econ Manag,2013
4. The era of state energy policy innovation: a review of policy instruments;Carley;Rev Policy Res,2011
5. Projected impacts of renewable portfolio standards on wind industry development in Michigan. Land Policy Institute;Adelaja,2007