- Author: Mayer René
- Language: Esperanto
- Year: 2003
- Author: White Alain Campbell, Weenink H. G. M., Hume George
- Language: English
- Year: 1926
- Author: Howard Kenneth Samuel
- Language: English
- Year: 1970
- Author: Gordon Peter, Hochberg Burton I.
- Language: English
- Year: 2005
- Author: Herland Sigmund
- Language: Romanian
- Year: 1948
- Author: Harkola Hannu Mauri
- Language: English
- Year: 2016
- Author: Ebert Hilmar.
- Language: German
- Year: 1987
- Author: Bláthy Ottó Titus
- Language: German
- Year: 1890