| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| 9 Elements of Family Business Success: A Proven Formula for Improving Leadership & Realtionships in Family Businesses | 978-0-07-154841-0 (0-07-154841-6) | 2008 |
| 9 Elements of Family Business Success: A Proven Formula for Improving Leadership ; Realtionships in Family Businesses | 978-0-07-014071-4 (0-07-014071-5) | 2008 |
| Seven Secrets of Great Entrepreneurial Masters: The GEM Power Formula For Lifelong Success | 978-0-07-147071-1 (0-07-147071-9) | 2006 |