- Author: Nimrod de Rosario
- Language: english
- Author: Loki Hulgaard
- Language: english
- Author: Erik Norling
- Language: Portuguese
- Year: 2013
- Author: Vincenzo Mantovani
- Language: Italian
- Year: 1979
- Author: Giorgio Israel
- Language: Italian
- Year: 2010
- Author: Roger Griffin
- Language: Spanish
- Year: 2010
- Author: Antonio Gramsci
- Language: Spanish
- Year: 1979
- Author: Pietro Gorgolini
- Language: Italian
- Year: 1922