Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Margin Requirements," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1971," Federal Reserve Bulletin (September 1971) : 71-71. https://fraser.stlouisfed.org/title/62/item/21442/toc/14234 , accessed on April 23, 2024.