Rambles in Rome : an archaeological and historical guide to the museums, galleries, villas, churches and antiquities of Rome and the Campagna / by S. Russell Forbes. - Forbes, S. Russell. (OLS)http://pul/name/645 (Thomas Nelson, 1887)

Mercier : (filosofo, educatore, sociologo) / Nicola Quitadamo. - Quitadano, Nicola. (OLS)http://pul/name/45377 (Soc. anonima editrice Dante Alighieri, 1930)
Bibliografia in nota.