Federal Reserve Bank of Dallas. "Amendment to Regulation P, Circular No. 81-55," District Notices (Federal Reserve Bank of Dallas) (March 16, 1981). https://fraser.stlouisfed.org/title/5569/item/541237, accessed on August 19, 2018.
Regulation P Minimum Security Devices and Procedures for Federal Reserve Banks and State Member Banks. 12 C.F.R. Part 216 Is Amended Effective With Date of Publication in the Federal Register.