- Author: Grant Heiken, Renato Funiciello, Donatella de Rita, Walter Veltroni
- Language: English
- Year: 2013
- Author: Walter Veltroni
- Language: Italian
- Author: Walter Veltroni
- Language: Italian
- Year: 2012
- Author: Grant Heiken Renato Funiciello Donatella de Rita Walter Veltroni
- Language: English
- Year: 2005
- Author: Walter Veltroni
- Language: Italian
- Year: 2006