Board of Governors of the Federal Reserve System (U.S.), 1935-. "Penn Square Bank in Oklahoma City closing so Receivers Certificates issued by Deposit Insurance National Bank of Oklahoma City will be accepted as collateral from depository institutions at the discount window" in Press Releases of the Board of Governors of the Federal Reserve System
(July 6, 1982).
https://fraser.stlouisfed.org/title/9237/item/695682, accessed on March 5, 2026.