United States. Bureau of Economic Analysis. "Gross Domestic Product (Third Estimate), Corporate Profits (Revised), and GDP by Industry, Third Quarter 2020, BEA 20-67,"
Bureau of Economic Analysis (BEA) News Releases
(December 22, 2020).
https://fraser.stlouisfed.org/title/6148/item/604890, accessed on June 16, 2025.