| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Metaphorical Management: Using Intuition and Creativity as a Guiding Mechanism for Complex Systems | 978-94-007-0340-7 (94-007-0340-6) | 2013 | |
| Ubuntu. In der Gemeinschaft Lösungen finden und Entscheidungen treffen | 978-3-7766-8007-2 (3-7766-8007-5) | 2006 | Willem de Liefde |