Federal Reserve Bank of Chicago. "Regulations T and U, Credit by Brokers and Dealers, Credit by Banks for the Purpose of Purchasing or Carrying Margin Stock, Circular No. 2233" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (June 7, 1972). https://fraser.stlouisfed.org/title/7180/item/666395, accessed on January 29, 2025.