United States. Bureau of Economic Analysis. "Personal Income by State, 2021 (Preliminary) and 4th Quarter 2021 : Full Release, BEA 22-10," Bureau of Economic Analysis (BEA) News Releases (March 23, 2022). https://fraser.stlouisfed.org/title/6148/item/611749/content/pdf/bea_newsreleases_20220323, accessed on March 16, 2025.