Board of Governors of the Federal Reserve System (U.S.), 1935-. "Date Availability for Preliminary Estimates: 1987. Q3," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 4, 1987," Z.1 Financial Accounts of the United States (1987-12-04) : 6-7. https://fraser.stlouisfed.org/title/93/item/69068/toc/483726 , accessed on April 19, 2024.