- Passkey EA Review, Complete: Individuals, Businesses, and Representation: IRS Enrolled Agent Exam Study Guide 2017-2018 Edition
- PassKey Learning Systems EA Review Part 3 Representation: Enrolled Agent Study Guide: May 1, 2021-February 28, 2022 Testing Cycle
- Passkey EA Review Complete: Individuals, Businesses, and Representation: IRS Enrolled Agent Exam Study Guide 2016-2017 Edition
- PassKey Learning Systems EA Review Part 1 Workbook: Three Complete IRS Enrolled Agent Practice Exams for Individuals:
- PassKey Learning Systems EA Review Part 2 Businesses; Enrolled Agent Study Guide: May 1, 2020-February 28, 2021 Testing Cycle





























