| title | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| 30 Minuten für die überzeugende Selbstdarstellung | 978-3-930799-91-6 | 1998 | ||
| 30 Minutes Career Kit | 978-0-7494-3804-3 | 2002 | Lynn Williams · June Lines | |
| 30 Minutes to Make the Right Impression | 978-0-7494-2525-8 | 1997 | ||
| Build Your Personal Brand | 978-0-7494-3851-7 | 2002 | ||
| Creative Business Presentations: Inventive Ideas for Making an Instant Impact | 978-0-7494-3853-1 | 2003 | ||
| Imaj Faktoru | 978-975-7805-44-1 | 1995 | ||
GABAL · Kogan Page · Rota Yayinlari