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/content/?item_id=542541&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19780919_no78-132.pdf, accessed on July 20, 2018.
Regulation Z, Amendment and Interpretation, Effective 8-31-78. Disclosure of Varying Payments and Minor Irregularities; Maximum Irregular Period Units.