Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of applications of Oklahoma National Banshares, Inc., for Oklahoma National Bank and Trust Company and to engage in credit-related insurance activities" in Press Releases of the Board of Governors of the Federal Reserve System
(November 27, 1978).
https://fraser.stlouisfed.org/title/9237/item/694489, accessed on January 6, 2026.