Board of Governors of the Federal Reserve System (U.S.), 1935-. "Margin Requirements Under Regulations T, U, G, and X," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1988," Annual Statistical Digest (November 1989) : 25-25. https://fraser.stlouisfed.org/title/7/item/23494/toc/426445 , accessed on May 9, 2024.