APA (7th ed.) Citation

Barber, M. (1995). Crusaders and heretics, 12th-14th centuries. Variorum.

Chicago Style (17th ed.) Citation

Barber, Malcolm. Crusaders and Heretics, 12th-14th Centuries. London ; Brookfield, Vt.: Variorum, 1995.

MLA (9th ed.) Citation

Barber, Malcolm. Crusaders and Heretics, 12th-14th Centuries. Variorum, 1995.

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