Gross Domestic Product, First Quarter 2021 (Advance Estimate) : Key Source Data and Assumptions, BEA 21-18
United States. Bureau of Economic Analysis. "Gross Domestic Product, First Quarter 2021 (Advance Estimate) : Key Source Data and Assumptions, BEA 21-18," Bureau of Economic Analysis (BEA) News Releases (April 29, 2021). https://fraser.stlouisfed.org/title/6148/item/602550/content/xlsx/bea_newsreleases_20210429_keysourcedata, accessed on March 17, 2025.