Vaticano minore. Altri scritti vaticani - Negro, Silvio. (OLS)http://semarc/name/30625 (Neri Pozza,, 1963)
Keywords: Pio X <papa; 1835-1914>. (OLS)http://semarc/subject/2400; Pio XI <papa; 1857-1939>. (OLS)http://semarc/subject/2399; Santa Sede. (OLS)http://semarc/subject/4519