Corpus juris canonici - Graciano, ca. 1090-1151; Gregorio IX, papa, 1143-1241. Decretales; Bonifacio VIII, papa, 1230-ca. 1303. Liber sextus decretalium; Clemente V, papa, 1264-1314. Constitutiones; Juan XXII, papa, 1249-1334. Extravagantes; Richter, Emilio Luis, 1823-1912, ed; Friedberg, Emil Albert, 1837-1910, ed; Tauchnitz, Bernhard, 1816-1895, imp