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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.
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Sherwood, Larry (June 2011). "U.S. Solar Market Trends 2010"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on February 26, 2021. Retrieved June 29, 2011.
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Sherwood, Larry (July 2014). "U.S. Solar Market Trends 2013"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on July 26, 2014. Retrieved July 28, 2014.
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 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 (June 2011). "U.S. Solar Market Trends 2010"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on February 26, 2021. Retrieved June 29, 2011.
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 (July 2013). "U.S. Solar Market Trends 2012"(PDF). Interstate Renewable Energy Council (IREC). p. 16. Archived from the original(PDF) on October 5, 2022. Retrieved October 11, 2013.
Sherwood, Larry (July 2014). "U.S. Solar Market Trends 2013"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on July 26, 2014. Retrieved July 28, 2014.
"Electric Power Annual State Data"[1]Archived May 1, 2019, at the Wayback Machine 1990-2017 Existing Name Plate and Summer Capacity by Energy Source and State retrieved April 11, 2019