APA (7th ed.) Citation

Riley-Smith, J. S. C. (1987). The Crusades: A short history (1. publ.). Athlone Press.

Chicago Style (17th ed.) Citation

Riley-Smith, Jonathan Simon Christopher. The Crusades: A Short History. 1. publ. London: Athlone Press, 1987.

MLA (8th ed.) Citation

Riley-Smith, Jonathan Simon Christopher. The Crusades: A Short History. 1. publ. Athlone Press, 1987.