- PassKey Learning Systems EA Review Part 1 Workbook: Three Complete IRS Enrolled Agent Practice Exams for Individuals:
- Passkey EA Review, Part 1: Individuals IRS Enrolled Agent Exam Study Guide 2015-2016 Edition
- Passkey Learning Systems EA Review Workbook: Six Complete IRS Enrolled Agent Practice Exams 2018-2019 Edition
- Passkey EA Review Complete: Individuals, Businesses, and Representation: IRS Enrolled Agent Exam Study Guide 2016-2017 Edition
- Passkey EA Review Workbook: Six Complete Enrolled Agent Practice Exams, 2015-2016 Edition