The origin of the idea of crusade - Erdmann, Carl, 1898-1945.; American Council of Learned Societies (Princeton, N.J. : Princeton University Press, 1977)
Translation of Die Entstehung des Kreuzzugsgedankens.
Includes bibliography (p. 373-427) and index.
Electronic text and image data.
Keywords: Crusades; Church history -- Middle Ages, 600-1500.