- Author: Momo Edel, Bertram Wallrath
- Language: Czech
- Year: 2009
- Author: Stewart K. Bertram
- Language: English
- Year: 2015
- Author: L. K Bertram
- Language: English
- Year: 2020
- Author: Tretter Bertram
- Language: German
- Year: 1974
- Author: Schefold Bertram
- Language: German
- Year: 1990
- Author: Schefold Bertram
- Language: German
- Year: 1989
- Author: Schefold Bertram
- Language: German
- Year: 1989
- Author: Ebert Bertram
- Language: German
- Year: 2001