United States. Bureau of Economic Analysis. "Gross National Product: Second Quarter 1991 (Final) | Corporate Profits: Second Quarter 1991 (Revised), BEA 91-41,"
Bureau of Economic Analysis (BEA) News Releases
(September 26, 1991).
https://fraser.stlouisfed.org/title/6148/item/597006, accessed on July 10, 2025.