^Sherwood, Larry (August 2012). "U.S. Solar Market Trends 2011"(PDF). Interstate Renewable Energy Council (IREC). p. 17. Archived from the original(PDF) on September 6, 2012. Retrieved August 16, 2012.
^Sherwood, Larry (June 2011). "U.S. Solar Market Trends 2010"(PDF). Interstate Renewable Energy Council (IREC). Retrieved June 29, 2011.
^Sherwood, Larry (July 2010). "U.S. Solar Market Trends 2009"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on September 25, 2010. Retrieved July 28, 2010.
^Sherwood, Larry (July 2009). "U.S. Solar Market Trends 2008"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on November 23, 2009. Retrieved July 24, 2010.
^Sherwood, Larry (July 2009). "U.S. Solar Market Trends 2008"(PDF). Interstate Renewable Energy Council (IREC). p. 16. Archived from the original(PDF) on November 23, 2009. Retrieved July 24, 2010.
^Sherwood, Larry (July 2012). "U.S. Solar Market Trends 2012"(PDF). Interstate Renewable Energy Council (IREC). p. 16. Retrieved October 11, 2013.
^Sherwood, Larry (July 2014). "U.S. Solar Market Trends 2013"(PDF). Interstate Renewable Energy Council (IREC). Retrieved September 26, 2014.
^"Montana Solar". Solar Energy Industries Association (SEIA). Retrieved May 6, 2020.