- Author: Theodor Hugues, Ludwig Steiger, Johann Weber
- Language: English
- Year: 2005
- Author: Theodor Hugues, Klaus Greilich, Christine Peter
- Language: English
- Year: 2013
- Author: Theodor Hugues, Ludwig Steiger, Johann Weber
- Language: German
- Year: 2012
- Author: Theodor Hugues, Ludwig Steiger, Johann Weber
- Language: German
- Year: 2012
- Author: Theodor Hugues, Klaus Greilich, Christine Peter
- Language: German
- Year: 2003
- Author: Theodor Hugues, Ludwig Steiger, Johann Weber
- Language: English
- Year: 2005
- Author: Theodor Hugues Klaus Greilich Christine Peter
- Language: German
- Year: 2003
- Author: Theodor Hugues
- Language: English
- Year: 2004
- Author: Johann Weber Theodor Hugues Ludwig Steiger
- Language: English
- Year: 2004
- Author: Johann Weber Theodor Hugues Ludwig Steiger
- Language: English
- Year: 2000