Di Fiore, L. (2018) The Invisibles: Political Police and Secret Agents in the Nineteenth-Century Mezzogiorno. SHARE Books (FedOAPress - Clio: Essays in History, Archaeology and Art History). Available at: https://www.fedoabooks.unina.it/index.php/fedoapress/catalog/book/81 (Accessed: 9 October 2026).