| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Customer Service 101: Basic Lessons to Be Your Best | 978-1-890181-00-0 (1-890181-00-5) | 1997 |
| Customer Service 201: Managing Your People to Be Their Best | 978-1-890181-01-7 (1-890181-01-3) | 1997 |
| Customer Service Training 101: Quick and Easy Techniques That Get Great Results | 978-0-8144-7290-3 (0-8144-7290-7) | 2005 |