Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of application by First Oklahoma Bancorporation, Inc., for First National Bank and Trust Company of Oklahoma City and Idabel National Bank" in Press Releases of the Board of Governors of the Federal Reserve System
(November 30, 1962).
https://fraser.stlouisfed.org/title/9237/item/697199, accessed on January 13, 2026.