The first Crusade and the idea of crusading.

MLA

Riley-Smith, Jonathan. The First Crusade and the Idea of Crusading. London: Continuum, 2003.

APA

Riley-Smith, J. (2003). The first Crusade and the idea of crusading. London: Continuum.

Chicago

Riley-Smith, Jonathan The First Crusade and the Idea of Crusading. London: Continuum, 2003.