| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Potega wybaczania | 978-83-62476-12-1 (83-62476-12-5) | 2015 | |
| Why You Still Need to Forgive Your Parents and How To Do It With Ease and Grace | 978-0-9821790-0-0 (0-9821790-0-6) | 2010 | Colin Tipping · Megan O'Connor |