| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1995 | 978-0-9644621-0-6 | C. Leslie Charles | Stick to It!: The Power of Positive Persistence |
| 1996 | 978-0-9644621-1-3 | C. Leslie Charles | The Customer Service Companion |
| 978-0-9644621-2-0 | '' | The Customer Service Companion Study Guide |