| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Certified Professional Organizer Exam Secrets Study Guide: CPO Test Review for the Certified Professional Organizer Examination | 978-1-62733-023-7 (1-62733-023-2) | 2013 |
| Certified Professional Organizer Exam Secrets Study Guide: CPO Test Review for the Certified Professional Organizer Examination | 978-1-62733-349-8 (1-62733-349-5) | 2013 |