United States. Bureau of Economic Analysis. "Gross National Product: Fourth Quarter 1988 (Final), Corporate Profits: Fourth Quarter 1988 (Preliminary), BEA 89-10,"
Bureau of Economic Analysis (BEA) News Releases
(March 23, 1989).
https://fraser.stlouisfed.org/title/6148/item/596890, accessed on June 14, 2025.