APA (7th ed.) Citation

Ellert, G. (1963). Gregory the Great. Harcourt, Brace & World.

Chicago Style (17th ed.) Citation

Ellert, Gerhart. Gregory the Great. New York: Harcourt, Brace & World, 1963.

MLA (9th ed.) Citation

Ellert, Gerhart. Gregory the Great. Harcourt, Brace & World, 1963.

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