- Author: Antonio Labriola
- Language: Italian
- Year: 2012
- Author: Antonio Labriola
- Language: French
- Year: 1897
Socrate
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- Author: Antonio Labriola
- Language: Italian
- Year: 1909
- Author: Antonio Labriola
- Language: English
- Year: 1980
- Author: Antonio Labriola
- Language: Spanish
- Year: 1969
- Author: Antonio Labriola Friedrich Engels Paul Lafargue V. I. Lenin
- Language: Spanish
- Year: 1973
- Author: Antonio Labriola
- Language: Italian
- Year: 2014
- Author: Antonio Labriola
- Language: Italian
- Year: 2014
- Author: Antonio Labriola
- Language: English
- Year: 1966