Federal Reserve Bank of Dallas. "Amendment to Regulation E, Circular No. 81-23," District Notices (Federal Reserve Bank of Dallas) (January 27, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541204&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810127_no81-023.pdf&start_page=1, accessed on September 23, 2017.
Effective 1-15-81. Electronic Fund Transfers. Text of an Amendment Furnished in Circular No. 81-12, Dated 1-15-81.