| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Mow zawsze Tak! Jak zdobyc i zatrzymac klienta | 978-83-88607-43-1 (83-88607-43-X) | 2004 |
| Start Up Marketing: An Entrepreneur's Guide to Advertising, Marketing and Promoting Your Business | 978-1-56414-256-6 (1-56414-256-6) | 1996 |