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- Nikolas Bertheau 4
- Stephen R. Covey 4
- Brian Tracy 3
- Claudia Franz 2
- Dörthe Huth 2
- Alexandra Hagemann 1
- Anja Klute 1
- Anke Fehring 1
- Anna Leinberger 1
- Axel Walter 1
- Ben Tiggelaar 1
- Carl Naughton 1
- Christian Greiser 1
- Christiane Wittig 1
- Cordula Nussbaum 1
- Daniel Crosby 1
- Dennis Fischer 1
- Erin Falconer 1
- Florian Pressler 1
- Frank Leyhausen 1
- Frauke Ion 1
- Gerda Köster 1
- Hans-Georg Willmann 1
- Hermann Scherer 1
- Jan Kuipers 1