| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Forests, Business and Sustainability | 978-1-138-77929-7 (1-138-77929-6) | 2015 | Rajat Panwar · Eric Hansen |
| Wedrówki z Gandalfem | 978-83-7746-374-1 (83-7746-374-1) | Brian Tracy | |
| Wedrówki z Gandalfem Przywództwo | 978-83-7746-373-4 (83-7746-373-3) | 2012 | " |
R.K. · R. Kozak · Robert A Kozak · Robert J. Kozak · Robert K. · Robert Kozak Brain Tracy · Robert Kozak Brian Tracy