- Author: Robert W. Vaagan (editor), Alex Byrne (editor)
- Language: English
- Year: 2002
- Author: Fred Oelssner
- Language: German
- Year: 1967
- Author: Hans Salié
- Language: German
- Year: 1955
- Author: Enno Heidebroek
- Language: German
- Year: 1955
- Author: Hans Luppa
- Language: German
- Year: 1978
- Author: Elena Seoane (editor), Carlos Acuña-Fariña (editor), Ignacio Palacios-Martínez (editor)
- Language: English
- Year: 2018
- Author: Johannes Lis
- Language: German
- Year: 2014
