Armstrong, Karen.  Holy War: The Crusades and Their Impact on Today's World.  New York: Anchor, 2001.

Goebel, Stefan.  Great War and Medieval Memory: War, Remembrance and Medievalism in Britain and Germany, 1914-1940.  Cambridge: Cambridge, 2007.

Kaeuper, Richard W.  Holy Warriors: The Religious Ideology Of Chivalry.  Philadelphia: Pennsylvania, 2009.

Riley-Smith, Jonathan.  Crusades, Christianity and Islam.  New York: Columbia, 2008.

Song of Roland