APA (7th ed.) Citation

Copleston, F. (1955). Aquinas. Penguin Books.

Chicago Style (17th ed.) Citation

Copleston, Frederick. Aquinas. Harmondsworth, Middlesex [etc.]: Penguin Books, 1955.

MLA (9th ed.) Citation

Copleston, Frederick. Aquinas. Penguin Books, 1955.

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