| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| 10 sposobów na zolze w pracy | 978-83-7489-557-6 (83-7489-557-8) | 2014 |
| Mean Girls at Work | 978-1-5012-1173-7 (1-5012-1173-0) | 2014 |
E C. · E. Crowley · "E. K." · K. C. · K. Elster · K.k. · Katherine Crowley · Kathi Elster