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- Language: Polish
- Year: 1977
- Author: Kazimierz Twardowski
- Language: English
- Year: 2015
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- Language: English
- Year: 1999
Der Briefwechsel
epub
- Author: Alexius Meinong (editor), Kazimierz Twardowski (editor), Venanzio Raspa (editor)
- Language: German
- Year: 2016
Der Briefwechsel
pdf
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- Language: German
- Year: 2016
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- Year: 2016
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- Year: 2016
- Author: Kazimierz Twardowski
- Language: German
- Year: 1892
- Author: Kazimierz Twardowski
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- Year: 1902
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- Year: 1988