United States. Bureau of Economic Analysis. "Gross Domestic Product (Third Estimate), Corporate Profits, and GDP by Industry, Fourth Quarter and Year 2020 : Highlights: Gross Domestic Product (Third Estimate), Corporate Profits, and GDP by Industry, Fourth Quarter and Year 2020, BEA 21-11,"
Bureau of Economic Analysis (BEA) News Releases
(March 25, 2021).
https://fraser.stlouisfed.org/title/6148/item/601651/content/pdf/bea_newsreleases_20210325_highlights, accessed on July 8, 2025.