APA (7th ed.) Citation

Thomas, A., Regan, R. J., & Davies, B. (2003). On evil. Oxford University Press.

Chicago Style (17th ed.) Citation

Thomas, Aquinas, Richard J. Regan, and Brian Davies. On Evil. Oxford ; New York: Oxford University Press, 2003.

MLA (9th ed.) Citation

Thomas, Aquinas, et al. On Evil. Oxford University Press, 2003.