APA (7th ed.) Citation

Copleston, F. C., & Ayer, A. J. (1957). Aquinas. Penguin Books.

Chicago Style (17th ed.) Citation

Copleston, Frederick C., and A. J. Ayer. Aquinas. [Harmondsworth, Middlesex, Eng.]: Penguin Books, 1957.

MLA (8th ed.) Citation

Copleston, Frederick C., and A. J. Ayer. Aquinas. Penguin Books, 1957.