- Passkey EA Review, Part 1: Individuals IRS Enrolled Agent Exam Study Guide 2015-2016 Edition
- PassKey Learning Systems EA Review Part 1 Individuals; Enrolled Agent Study Guide: July 1, 2019-February 29, 2020 Testing Cycle
- Passkey EA Review Workbook: Six Complete Enrolled Agent Practice Exams, 2015-2016 Edition
- PassKey Learning Systems EA Review Part 1 Individuals; Enrolled Agent Study Guide: May 1, 2020-February 28, 2021 Testing Cycle
- Passkey EA Review Complete: Individuals, Businesses, and Representation: IRS Enrolled Agent Exam Study Guide 2015-2016 Edition