- Author: Willem H. van Boom (editor), Gerhard Wagner (editor)
- Language: English
- Year: 2014
- Author: Gerhard Wagner
- Language: German
- Year: 2012
- Author: Gerhard Wagner [Hrsg.]
- Language: German
- Year: 1981
- Author: Gerhard Wagner [Hrsg.]
- Language: German
- Year: 1977
- Author: Gerhard Wagner [Hrsg.]
- Language: German
- Year: 1980
- Author: Gerhard Wagner [Hrsg.]
- Language: German
- Year: 1976
- Author: Gerhard Wagner [ed.]
- Language: German
- Year: 1975
- Author: Karin Ikas and Gerhard Wagner
- Language: English
- Year: 2009
- Author: Gerhard Wagner
- Language: German
- Year: 2011