Tyerman, Christopher The invention of the crusades / Christopher Tyerman - Basingstoke : Macmillan, 1998 - ix, 170 p. ; 23 cm. Select bibliography : p. 158-161 ISBN: 0333669010 RM318.54 LCCN: 99-171038 Subjects--Topical Terms: CrusadesCrusades--Historiography