APA (7th ed.) Citation

Riley-Smith, L., & Riley-Smith, J. S. C. (1981). The crusades: Idea and reality, 1095-1274. Arnold.

Chicago Style (17th ed.) Citation

Riley-Smith, Louise, and Jonathan Simon Christopher Riley-Smith. The Crusades: Idea and Reality, 1095-1274. London: Arnold, 1981.

MLA (9th ed.) Citation

Riley-Smith, Louise, and Jonathan Simon Christopher Riley-Smith. The Crusades: Idea and Reality, 1095-1274. Arnold, 1981.

Warning: These citations may not always be 100% accurate.