- PassKey Learning Systems EA Review Part 1 Individuals; Enrolled Agent Study Guide: July 1, 2019-February 29, 2020 Testing Cycle
- Passkey EA Review, Part 1: Individuals IRS Enrolled Agent Exam Study Guide 2015-2016 Edition
- Passkey EA Review Complete: Individuals, Businesses, and Representation: IRS Enrolled Agent Exam Study Guide 2015-2016 Edition
- Passkey Learning Systems EA Review Complete: Individuals, Businesses, and Representation: Enrolled Agent Exam Study Guide 2018-2019 Edition (Hardcover)
- Passkey EA Review, Part 2: Businesses, IRS Enrolled Agent Exam Study Guide 2014-2015 Edition