United States. Bureau of Economic Analysis. "Gross National Product: First Quarter 1989 (Preliminary) | Corporate Profits: First Quarter 1989 (Preliminary), BEA 89-19," Bureau of Economic Analysis (BEA) News Releases (May 25, 1989). https://fraser.stlouisfed.org/title/6148/item/596905, accessed on March 19, 2025.