From Aviation Supplies & Academics, trusted publisher of Federal Aviation Administration resources. This book is also available bundled with the ASA Commercial Pilot Test Prep.

This FAA-CT-8080-1E is the most current testing supplement, released by the FAA in June 2018. It supersedes the earlier FAA-CT-8080-1D, dated 2016.

This Airman Knowledge Testing Supplement is designed by the Federal Aviation Administration (FAA) Flight Standards Service. It is intended for use by Airman Knowledge Testing (AKT) Organization Designation Authorization (ODA) Holders and other entities approved and/or authorized to administer airman knowledge tests on behalf of the FAA in the following knowledge areas:
Commercial Pilot--Airplane (CAX)
Commercial Pilot--Glider (CGX)
Commercial Pilot--Lighter-Than-Air-Airship (CLA)
Commercial Pilot--Rotorcraft/Gyroplane (CRG)
Commercial Pilot--Rotorcraft/Helicopter (CRH)
Commercial Pilot--Balloon Gas (CBG)
Commercial Pilot--Balloon-Hot Air (CBH)
Military Competence for Commercial Pilot Certification, Non-Category Specific (MCN)