United States. Bureau of Economic Analysis. "Gross Domestic Product, First Quarter 2021 (Advance Estimate) : Effects of Selected Federal Pandemic Response Programs on Personal Income, BEA 21-18," Bureau of Economic Analysis (BEA) News Releases (April 29, 2021). https://fraser.stlouisfed.org/title/6148/item/602550/content/pdf/bea_newsreleases_20210429_effects-personal-2021Q1-adv, accessed on March 27, 2025.