Board of Governors of the Federal Reserve System (U.S.), 1935-. "Regulation D amended to provide that the term calendar month includes any statement cycle or similar four week period for purposes of permissible transfers" in Press Releases of the Board of Governors of the Federal Reserve System
(December 8, 1980).
https://fraser.stlouisfed.org/title/9237/item/695209, accessed on March 9, 2026.