APA (7th ed.) Citation

Boase, T. S. R. (1967). Castles and churches of the crusading kingdom. Oxford U.P..

Chicago Style (17th ed.) Citation

Boase, T. S. R. Castles and Churches of the Crusading Kingdom. London, New York [etc.]: Oxford U.P., 1967.

MLA (9th ed.) Citation

Boase, T. S. R. Castles and Churches of the Crusading Kingdom. Oxford U.P., 1967.