Board of Governors of the Federal Reserve System (U.S.), 1935-. "Revised list of OTC stocks subject to margin regulations and foreign equity securities meeting the margin criteria in Regulation T" in Press Releases of the Board of Governors of the Federal Reserve System (April 28, 1997). https://fraser.stlouisfed.org/title/9237/item/674515, accessed on May 14, 2025.