APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Aaron, Richard I. The Theory of Universals. 2nd ed. Oxford: At the Clarendon Press, 1967.

MLA (9th ed.) Citation

Aaron, Richard I. The Theory of Universals. 2nd ed. At the Clarendon Press, 1967.