- Author: Karl R. Popper
- Language: English
- Year: 2020
- Author: Karl Raimund Popper
- Language: English
- Year: 1997
- Author: Karl Raimund Popper
- Language: English
- Year: 1963
- Author: Karl R. Popper Dario Antiseri (editor)
- Language: Italian
- Year: 1997
- Author: Karl R. Popper
- Language: Spanish
- Year: 1992
- Author: Karl R. Popper
- Language: Portuguese
- Author: Karl R. Popper
- Language: Spanish
- Year: 1967
- Author: KARL R. POPPER
- Language: German
- Year: 1974
- Author: Karl R. Popper Konrad Lorenz
- Language: German
- Year: 1988