APA (7th ed.) Citation

Aaron, R. I. (1967). The theory of universals (2d ed.). Clarendon Press.

Chicago Style (17th ed.) Citation

Aaron, Richard I. The Theory of Universals. 2d ed. London: Clarendon Press, 1967.

MLA (9th ed.) Citation

Aaron, Richard I. The Theory of Universals. 2d ed. Clarendon Press, 1967.