Board of Governors of the Federal Reserve System (U.S.), 1935-. "Margin Credit, by Source," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1972-1976," Annual Statistical Digest (December 1977) : 366-366. https://fraser.stlouisfed.org/title/7/item/23503/toc/117719 , accessed on April 25, 2024.