Papal crusading policy : the chief instruments of papal crusading policy and crusade to the Holy Land from the final loss of Jerusalem to the fall of Acre 1244-1291 - Purcell, Maureen (Leiden : Brill, 1975)
Includes index.
Bibliography: p. [202]-212.
Keywords: Papacy -- History -- To 1309.; Church history -- Middle Ages, 600-1500.; Indulgences; Crusades