Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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