United States. Bureau of Economic Analysis. "State Personal Income, Second Quarter 2007 : Full Release, BEA 07-42," Bureau of Economic Analysis (BEA) News Releases (September 20, 2007). https://fraser.stlouisfed.org/title/6148/item/598983/content/pdf/bea_newsreleases_20070920_release, accessed on June 13, 2025.