APA (7th ed.) Citation

Riley-Smith, J. S. C. (1990). The atlas of the Crusades. Facts on File.

Chicago Style (17th ed.) Citation

Riley-Smith, Jonathan Simon Christopher. The Atlas of the Crusades. New York: Facts on File, 1990.

MLA (8th ed.) Citation

Riley-Smith, Jonathan Simon Christopher. The Atlas of the Crusades. Facts on File, 1990.