Tyerman, Christopher. The Crusades : a very short introduction / Christopher Tyerman. - Oxford ; New York : Oxford University Press, 2005. - 167 p. : ill., maps ; 18 cm. - A very short introductions . Previously published as: Fighting for Christendom. 2004. Includes bibliographical references and index. ISBN: 9780192806550 0192806556 (alk. paper) LCCN: 2005019578 Subjects--Topical Terms: Crusades. LC Class. No.: D157 / .T88 2005 Dewey Class. No.: 909.07 / TYT 2004