Federal Reserve Bank of Dallas. "Amendment to Regulation Z, Circular No. 80-148," District Notices (Federal Reserve Bank of Dallas) (July 30, 1980). https://fraser.stlouisfed.org/scribd/?item_id=541075&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19800730_no80-148.pdf&start_page=1, accessed on October 20, 2017.
Regulation Z Truth in Lending. Amendment Effective 8-1-80, through 3-31-81. Increase Tolerance for Accuracy in Disclosure of Annual Percentage Rate (APR) in Mortgage Transactions.