- Italian Fascism: Its Origins and Development
- Fascist Italy and Nazi Germany: The 'Fascist' Style of Rule (Historical Connections)
- The Italian Left in the Twentieth Century: A History of the Socialist and Communist Parties
- In Stalin's Shadow: Angelo Tasca and the Crisis of the Left in Italy and France, 1910-1945
- The Hunchback's Tailor: Giovanni Giolitti and Liberal Italy from the Challenge of Mass Politics to the Rise of Fascism, 1882-1922 (Italian and Italian American Studies)