Federal Reserve Bank of Dallas. "Changes in Regulation Z -- Truth-in-Lending, Circular No. 78-132," District Notices (Federal Reserve Bank of Dallas) (September 19, 1978). https://fraser.stlouisfed.org/title/5569/item/542541, accessed on August 14, 2018.
Regulation Z, Amendment and Interpretation, Effective 8-31-78. Disclosure of Varying Payments and Minor Irregularities; Maximum Irregular Period Units.