The Anatomy of an AD: Does it apply? Is it signed off?
AD Compliance 101: FAA AC39-7D Rules - Aviation Consumer
Airworthiness Directives - Federal Aviation Administration
14 CFR Part 39 - PART 39—AIRWORTHINESS DIRECTIVES
eCFR :: 14 CFR Part 39 -- Airworthiness Directives (FAR Part 39)
Rules & Regulations - Airworthiness - CFI Notebook
Guide to Aircraft Airworthiness - AOPA