| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Private Investigator Exam Flashcard Study System: PI Test Practice Questions & Review for the Private Investigator Exam | 978-1-61072-777-8 (1-61072-777-0) | 2013 |
| Private Investigator Exam Secrets Study Guide: PI Test Review for the Private Investigator Exam | 978-1-61072-776-1 (1-61072-776-2) | 2013 |