APA (7th ed.) Citation

Urmson, J. O., & Ackrill, J. L. (1960). The concise encyclopedia of Western philosophy and philosophers. Hawthorn.

Chicago Style (17th ed.) Citation

Urmson, J. O., and J. L. Ackrill. The Concise Encyclopedia of Western Philosophy and Philosophers. New York: Hawthorn, 1960.

MLA (9th ed.) Citation

Urmson, J. O., and J. L. Ackrill. The Concise Encyclopedia of Western Philosophy and Philosophers. Hawthorn, 1960.