United States. Bureau of Economic Analysis. "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, accessed on June 23, 2025.