Federal Reserve Bank of Chicago. "Regulation G, Securities Credit by Persons Other Than Banks, Brokers, or Dealers, Regulation U, Credit by Banks for the Purpose of Purchasing or Carrying Margin Stock, Circular No. 2688" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (July 17, 1978). https://fraser.stlouisfed.org/title/7180/item/669622, accessed on January 29, 2025.