| title | ISBN-13 | year of publication |
|---|---|---|
| 365 Thank Yous: The Year a Simple Act of Daily Gratitude Changed My Life | 978-1-4013-2405-6 | 2010 |
| A Simple Act of Gratitude: How Learning to Say Thank You Changed My Life | 978-1-4013-1071-4 | 2011 |
| Elke dag een glimlach / druk 1 | 978-90-225-5868-3 | 2011 |
| Il potere della gratitudine | 978-88-200-5051-1 | 2011 |
Boekerij, De · Hyperion · Sperling & Kupfer