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-. "1980," Annual Statistical Digest (November 1981) : 32-32. https://fraser.stlouisfed.org/title/7/item/23507/toc/300776 , accessed on July 12, 2024.