| title | ISBN-13 | year of publica- tion |
|---|---|---|
| 100 Simple Secrets of Happy Families | 978-1-84112-693-7 | 2005 |
| 100 Simple Secrets of Happy People | 978-1-84112-685-2 | 2005 |
| 100 Simple Secrets of Healthy People | 978-1-84112-694-4 | 2005 |
| 100 Simple Secrets of the Best Half of Life | 978-1-84112-697-5 | 2005 |
| The 100 Simple Secrets of Successful People | 978-1-84112-684-5 | 2005 |