| title | ISBN-13 | year of publication | |
|---|---|---|---|
| Business-Strategien für Einsteiger | 978-3-426-83024-6 | 1995 | |
| How to Pass Exams | 978-1-74114-551-9 | 2005 | |
| How to Succeed at Work: Gaining the Psychological Edge | 978-0-04-158009-9 | 1990 | |
| Vincere la timidezza | 978-88-7818-857-0 | 2001 |
Allen & Unwin · Droemer Knaur · HarperCollins · TEA