Federal Reserve Bank of Dallas. "Booklet on Security and Control of Funds Transfers, Circular No. 81-73," District Notices (Federal Reserve Bank of Dallas) (April 13, 1981). https://fraser.stlouisfed.org/content/?item_id=541255&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810413_no81-073.pdf, accessed on May 24, 2018.
Bulletin 6 Related. Written for Auditors by the Auditing Department of Federal Reserve Bank Dallas.