- Author: Giuliano Procacci, Grigori Zinóviev, José Stalin, Edward H. Carr
- Language: Spanish
- Year: 1972
- Author: Giuliano Procacci, León Trotski, Nicolai Bujarin, Grigori Zinóviev
- Language: Spanish
- Year: 1972
- Author: Giuliano Procacci, Anthony Paul
- Language: English
- Year: 1973
- Author: Giuliano Procacci
- Language: Italian
- Year: 1974
- Author: Bucharin Stalin Trotskij Zinovjev, Giuliano Procacci (ed.)
- Language: Italian
- Year: 1970