United States. Bureau of Economic Analysis. "Gross Domestic Product by State, 4th Quarter 2021 and Year 2021 (Preliminary) : Highlights: Gross Domestic Product by State, 4th Quarter 2021, BEA 22-15," Bureau of Economic Analysis (BEA) News Releases (March 31, 2022). https://fraser.stlouisfed.org/title/6148/item/611775/content/pdf/bea_newsreleases_20220331b_highlights, accessed on May 14, 2025.