PURCELL, M.: Papal Crusading Policy. The Chief lnstruments of Papal Crusadining Policy and Crusade to the Holy Land from the final loss of Jerusalem to the fall of Acre [1244-1291] (Leiden. E. J. Brill, 1975), x-236 págs.
García y García, Antonio. "PURCELL, M.: Papal Crusading Policy. The Chief lnstruments of Papal Crusadining Policy and Crusade to the Holy Land from the final loss of Jerusalem to the fall of Acre [1244-1291] (Leiden. E. J. Brill, 1975), x-236 págs.". ANUARIO DE HISTORIA DEL DERECHO ESPAÑOL. 1976. pp. 816-816.
