- Author: Raymond Smullyan
- Language: Italian
- Year: 1981
- Author: Dimitris Chassapakis
- Language: English
- Year: 2017
- Author: Douglas R.Hofstadter
- Language: English
- Year: 1999
- Author: Stanisław Kowal
- Language: Polish
- Year: 1969
- Author: Hugo Steinhaus
- Language: Polish
- Year: 1989
- Author: Jeleński Szczepan
- Language: Polish
- Year: 1956
- Author: Raymond M. Smullyan
- Language: English
- Year: 2010
- Author: Берендс Э.
- Language: Русский
- Year: 2016
- Author: Collected by Gabriel F. Calvo
- Language: English
- Year: 2017
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- Language: English
- Year: 2016