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-. "1973-1977," Annual Statistical Digest (December 1978) : 350-350. https://fraser.stlouisfed.org/title/7/item/23504/toc/110196 , accessed on April 18, 2024.