Board of Governors of the Federal Reserve System (U.S.), 1935-. "Trade Credit, Seasonally Adjusted Annual Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 12, 1980," Z.1 Financial Accounts of the United States (1980-05-12) : 52-52. https://fraser.stlouisfed.org/title/93/item/69089/toc/480287 , accessed on April 23, 2024.