United States. Bureau of Economic Analysis. "Gross Domestic Product by State, 2005-2014 (Prototype Statistics) : Full Release, BEA 15-40,"
Bureau of Economic Analysis (BEA) News Releases
(September 2, 2015).
https://fraser.stlouisfed.org/title/6148/item/602258/content/pdf/bea_newsreleases_20150902, accessed on May 21, 2025.