United States. Bureau of Economic Analysis. "Gross National Product: Second Quarter 1991 (Preliminary) | Corporate Profits: Second Quarter 1991 (Preliminary), BEA 91-36," Bureau of Economic Analysis (BEA) News Releases (August 28, 1991). https://fraser.stlouisfed.org/title/6148/item/597000, accessed on March 22, 2025.