APA (7th ed.) Citation

Zernov, N. M. (1961). Eastern Christendom. History of religion.

Chicago Style (17th ed.) Citation

Zernov, Nikolaj M. "Eastern Christendom." History of Religion 1961.

MLA (8th ed.) Citation

Zernov, Nikolaj M. "Eastern Christendom." History of Religion, 1961.

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