- PassKey Learning Systems EA Review Part 1 Individuals; Enrolled Agent Study Guide: May 1, 2020-February 28, 2021 Testing Cycle
- Passkey EA Review Workbook: Six Complete IRS Enrolled Agent Practice Exams, 2014-2015 Edition
- Passkey EA Review, Part 2: Businesses, IRS Enrolled Agent Exam Study Guide 2014-2015 Edition
- Passkey EA Review Workbook: Six Complete Enrolled Agent Practice Exams, 2015-2016 Edition
- Passkey Learning Systems EA Review Workbook: Six Complete IRS Enrolled Agent Practice Exams 2018-2019 Edition