United States. Bureau of Economic Analysis. "Gross National Product: First Quarter 1990 (Advance), Corporate Profits: Fourth Quarter 1989 (Revised), BEA 90-15,"
Bureau of Economic Analysis (BEA) News Releases
(April 27, 1990).
https://fraser.stlouisfed.org/title/6148/item/596736, accessed on June 18, 2025.