- Author: Jürg Fleischer (editor), Elisabeth Rieken (editor), Paul Widmer (editor)
- Language: English
- Year: 2015
- Author: Jürg Fleischer (editor), Elisabeth Rieken (editor), Paul Widmer (editor)
- Language: English
- Year: 2015
- Author: Götz Keydana (editor), Wolfgang Hock (editor), Paul Widmer (editor)
- Language: English
- Year: 2021
- Author: Götz Keydana (editor), Wolfgang Hock (editor), Paul Widmer (editor)
- Language: English
- Year: 2021
- Author: Hartmut Katz, Paul Widmer (editor), Anna Widmer (editor), Gerson Klumpp (editor)
- Language: German
- Year: 2003