Board of Governors of the Federal Reserve System (U.S.), 1935-. "Detailed Debit and Credit Balances at Brokers Carrying Margin Accounts," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1988," Annual Statistical Digest (November 1989) : 230-230. https://fraser.stlouisfed.org/title/7/item/23494/toc/426516 , accessed on May 10, 2024.