APA (7th ed.) Citation

Walls, J. L. (2012). Purgatory: The logic of total transformation. Oxford University Press.

Chicago Style (17th ed.) Citation

Walls, Jerry L. Purgatory: The Logic of Total Transformation. Oxford: Oxford University Press, 2012.

MLA (9th ed.) Citation

Walls, Jerry L. Purgatory: The Logic of Total Transformation. Oxford University Press, 2012.