| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| What S Keeping Your Customers Up At Night | 978-0-07-058780-9 (0-07-058780-9) | 2004 | |
| What's Keeping Your Customers Up at Night?: Close More Deals by Selling to Your Client's Pain | 978-0-07-141103-5 (0-07-141103-8) | 2003 | Richard Harte |