United States. Bureau of Economic Analysis. "Gross Domestic Product (Third Estimate), Corporate Profits (Revised Estimate), and GDP by Industry, Third Quarter 2021 : Highlights: Gross Domestic Product (Third Estimate), Corporate Profits (Revised Estimate), and GDP by Industry, Third Quarter 2021, BEA 21-67," Bureau of Economic Analysis (BEA) News Releases (December 22, 2021). https://fraser.stlouisfed.org/title/6148/item/610236/content/pdf/bea_newsreleases_20211222_highlights, accessed on March 20, 2025.