APA (7th ed.) Citation

Pegis, A. C. (1948). Introduction to Saint Thomas Aquinas. Modern library.

Chicago Style (17th ed.) Citation

Pegis, Anton Charles. Introduction to Saint Thomas Aquinas. New York: Modern library, 1948.

MLA (9th ed.) Citation

Pegis, Anton Charles. Introduction to Saint Thomas Aquinas. Modern library, 1948.