Walls, J. L. (2012). Purgatory: The logic of total transformation. Oxford University Press.
Chicago Style (17th ed.) CitationWalls, Jerry L. Purgatory: The Logic of Total Transformation. Oxford: Oxford University Press, 2012.
MLA (9th ed.) CitationWalls, Jerry L. Purgatory: The Logic of Total Transformation. Oxford University Press, 2012.
Warning: These citations may not always be 100% accurate.