Board of Governors of the Federal Reserve System (U.S.), 1935-. "Margin Requirements," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1981," Annual Statistical Digest (October 1982) : 28-28. https://fraser.stlouisfed.org/title/7/item/23508/toc/396149 , accessed on April 26, 2024.