| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Secrets of Word-of-Mouth Marketing | 978-1-63312-125-6 (1-63312-125-9) | 2006 |
| The Secrets of Word-Of-Mouth Marketing: How to Trigger Exponential Sales Through Runaway Word of Mouth | 978-0-8144-2566-4 (0-8144-2566-6) | 2001 |
| The Secrets of Word-of-Mouth Marketing: How to Trigger Exponential Sales Through Runaway Word of Mouth | 978-0-8144-7072-5 (0-8144-7072-6) | 2001 |