- Author: Beholz S., Ennker J., Ennker Jürgen, Kleine P., Kleine Peter
- Language: German
- Year: 2008
- Author: Gasser Annette, Kleine Peter, Pietrowski Detlef, Ennker Jürgen
- Language: German
- Year: 2007
- Author: Bauer Kerstin, Bauer Stefan, Ennker Jürgen
- Language: German
- Year: 2011