- Author: Krammer Lange-Beralot
- Language: German
- Year: 1986
- Author: Kurt Krammer Horst Lange-Bertalot
- Language: English
- Year: 1988
- Author: Krammer Lange-Beralot
- Language: German
- Year: 1986
- Author: Kurt Krammer Horst Lange-Bertalot
- Language: English
- Year: 1988