APA (7th ed.) Citation

Lock, P. (2006). The Routledge companion to the crusades. Routledge.

Chicago Style (17th ed.) Citation

Lock, Peter. The Routledge Companion to the Crusades. London: Routledge, 2006.

MLA (9th ed.) Citation

Lock, Peter. The Routledge Companion to the Crusades. Routledge, 2006.

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