United States. Bureau of Economic Analysis. "Gross National Product: First Quarter 1987 (Revised), Corporate Profits: First Quarter 1987 (Revised), BEA 87-29,"
Bureau of Economic Analysis (BEA) News Releases
(June 17, 1987).
https://fraser.stlouisfed.org/title/6148/item/596674, accessed on July 16, 2025.