APA (7th ed.) Citation

Nicol, D. M. (1962). Byzantium and the papacy in the eleventh century.

Chicago Style (17th ed.) Citation

Nicol, Donald MacGillivray. Byzantium and the Papacy in the Eleventh Century. 1962.

MLA (9th ed.) Citation

Nicol, Donald MacGillivray. Byzantium and the Papacy in the Eleventh Century. 1962.

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