Truth in Lending (Reg. Z).
Appendices, model forms, and commentary are included in the link to the last section of the regulation:
Subpart A – General.
Subpart B – Open-end credit.
Subpart C – Closed-end credit.
Subpart D – Miscellaneous.
Subpart E – Special rules for certain home mortgage transactions.
Subpart F – Special Rules for Private Education Loans.
Subpart G—Special Rules Applicable to Credit Card Accounts and Open-End Credit Offered to College Students.