Federal Reserve Bank of Dallas. "New Bulletin 11, Circular No. 81-155," District Notices (Federal Reserve Bank of Dallas) (July 30, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541337&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810730_no81-155.pdf&start_page=1, accessed on September 21, 2017.
Automated Clearing House Operations Effective 8-1-81. ACH Service Available to All Depository Institutions. Includes Time and Fee Schedules as Appendices a and B.