Martyrologium romanum - Grosjean, Paulus; Gaiffier, Baudouin de, S.I., 1897-; Coens, Mauritius; Peeters, Paul, S.I., 1870-1950; Delehaye, Hippolyte, S.I., 1859-1941; Halkin, François, S.I., 1901-1988 ([s.n.], 1940)