- Author: Karl Schrader
- Language: German
- Year: 1890
- Author: August Deppe
- Language: German
- Year: 1880
- Author: Theodor Mommsen
- Language: German
- Year: 1885
- Author: Hermann Veltmann
- Language: German
- Year: 1886
- Author: Hermann Kurtz
- Language: German
- Year: 1890