| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Den Store Idé | 978-87-997604-0-4 | 2014 | |
| How to Be a Leader | 978-1-250-07873-5 | 2016 | |
| How to be a Leader | 978-1-4472-9327-9 | 2016 | Cosmina Popa · The School of Life |
| Sukces bez wyrzeczen | 978-83-7818-694-6 | 2015 | |
Pan Books · Pine Tribe · Rebis · St. Martin's Press