The app for the book by Michael Stecher - Volume 1
- Methodological and didactic conception: Michael Stecher
- Illustrations: Michael Stecher
- Audio production: Michael Stecher & Burkhard Osteneck
- Technical realization: AREA-NET GmbH, Donzdorf
- Editing: Burkhard Osteneck
- Methodological and didactic conception: Michael Stecher
- Illustrations: Michael Stecher
- Audio production: Michael Stecher & Burkhard Osteneck
- Technical realization: AREA-NET GmbH, Donzdorf
- Editing: Burkhard Osteneck
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