2: I documenti. - Pirri, Pietro. (OLS)http://ftis/name/54456 (3 La questione romana 1864-1870, 1961)

Le Bonheur de Spinoza - Henry, Michel, 1922-2002. (OLS)http://ftis/name/53841; Longneaux, Jean-Michel. (OLS)http://ftis/name/72943 (Presses Universitaires de France, 2004)