Federal Reserve Bank of Dallas. "Regulation Z, Circular No. 81-234," District Notices (Federal Reserve Bank of Dallas) (December 11, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541416&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19811211_no81-234.pdf&start_page=1, accessed on September 19, 2017.
Truth in Lending. Revision of Official Staff Commentary Effective 12-4-81, Announced in Federal Reserve Board Press Release of 11-27-81.