APA (7th ed.) Citation

Regan, G. (2001). First crusader: Byzantium's holy wars (1. publ.). Sutton.

Chicago Style (17th ed.) Citation

Regan, Geoffrey. First Crusader: Byzantium's Holy Wars. 1. publ. Stroud: Sutton, 2001.

MLA (8th ed.) Citation

Regan, Geoffrey. First Crusader: Byzantium's Holy Wars. 1. publ. Sutton, 2001.

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