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/title/5569/item/541075, accessed on December 15, 2018.
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.