APA (7th ed.) Citation

Gilson, E. H. (1955). History of Christian philosophy in the Middle Ages. Random House.

Chicago Style (17th ed.) Citation

Gilson, Etienne Henry. History of Christian Philosophy in the Middle Ages. New York: Random House, 1955.

MLA (9th ed.) Citation

Gilson, Etienne Henry. History of Christian Philosophy in the Middle Ages. Random House, 1955.

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