See Julien Théry-Astruc, "Introduction", in Innocent III et le Midi (Cahiers de Fanjeaux, 50), Toulouse, Privat, 2015, pp. 11–35, at pp. 13–14.
2017년 1월 23일에 확인함.  See Julien Théry-Astruc, "Introduction", in Innocent III et le Midi (Cahiers de Fanjeaux, 50), Toulouse, Privat, 2015, pp. 11-35, at pp. 13-14.