Board of Governors of the Federal Reserve System (U.S.), 1935-. "Tabulation of bank credit card and check - credit plan information for all insured commercial banks - released" in Press Releases of the Board of Governors of the Federal Reserve System
(July 24, 1967).
https://fraser.stlouisfed.org/title/9237/item/697545, accessed on July 11, 2026.