- Author: Volker Depkat (editor), Piero Graglia (editor)
- Language: German
- Year: 2010
- Author: Piero Giordanetti (editor), Riccardo Pozzo (editor), Marco Sgarbi (editor)
- Language: German
- Year: 2012
- Author: Piero S. Graglia
- Language: Italian
- Year: 2022
- Author: Piero Ignazi, Enzo Risso, Spencer Wellhofer
- Language: Italian
- Year: 2022
- Author: Piero Martinetti
- Language: Italian
- Year: 1981
- Author: Piero Martinetti
- Language: Italian
- Year: 1896
- Author: Piero Martin
- Language: English
- Year: 2023
- Author: Mario Pescante Piero Mei
- Language: Italian
- Year: 2003
