United States. Bureau of Economic Analysis. "National Income and Product Accounts : Second Quarter 1988 GNP, Revised Estimates 1985 Through First Quarter 1988, BEA 88-34," Bureau of Economic Analysis (BEA) News Releases (July 27, 1988). https://fraser.stlouisfed.org/title/6148/item/596832, accessed on March 15, 2025.