Diplomazia pontificia e Kulturkampf la Santa Sede e la Prussia tra Pio IX e Bismarck, 1862-1878 - Valente, Massimiliano 1967- (Studium, 2004)
Giovanni Maria Mastai Ferretti (1792-1878), Pope Pius IX; Otto von Bismarck (1815-1898). - Contains bibliographical references, notes and name index