APA (7th ed.) Citation

Gilson, E. (1955). History of Christian philosophy in the Middle Ages. Sheed and Ward.

Chicago Style (17th ed.) Citation

Gilson, Etienne. History of Christian Philosophy in the Middle Ages. London: Sheed and Ward, 1955.

MLA (8th ed.) Citation

Gilson, Etienne. History of Christian Philosophy in the Middle Ages. Sheed and Ward, 1955.

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