| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Word of Mouth Marketing: How Smart Companies Get People Talking | 978-1-4195-9333-8 (1-4195-9333-1) | 2006 |
| Word of Mouth Marketing: How Smart Companies Get People Talking, Revised Edition | 978-1-4277-9861-9 (1-4277-9861-3) | 2009 |