APA (7th ed.) Citation

Nicol, D. M. (1986). The crusades and the unity of Christendom. Dr. Willams's Trust.

Chicago Style (17th ed.) Citation

Nicol, Donald MacGillivray. The Crusades and the Unity of Christendom. London: Dr. Willams's Trust, 1986.

MLA (9th ed.) Citation

Nicol, Donald MacGillivray. The Crusades and the Unity of Christendom. Dr. Willams's Trust, 1986.

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