United States. Bureau of Economic Analysis. "National Income and Product Accounts : Revised Estimates, 1929-80, Third Quarter 1980 (Revised), BEA 80-79,"
Bureau of Economic Analysis (BEA) News Releases
(December 23, 1980).
https://fraser.stlouisfed.org/title/6148/item/595988, accessed on June 16, 2025.