United States. Department of Commerce. "National Income and Product Accounts : Second Quarter 1989 GNP (Advance), Revised Estimates: 1986 Through First Quarter 1989, BEA 89-33,"
United States Department of Commerce News
(July 27, 1989).
https://fraser.stlouisfed.org/title/6148/item/596924, accessed on May 31, 2026.