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/scribd/?item_id=541237&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810316_no81-055.pdf&start_page=1, accessed on October 16, 2017.
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.