1. American Psychiatric Association. 1981. Diagnostic and Statistical Manual of Mental Disorders (DSM). 3rd edn. Washington, DC: American Psychiatric Association.
2. Bloomfield, M.W. 1952. The Seven Deadly Sins: An Introduction to the History of a Religious Concept with Special Reference to Medieval English Literature. East Lansing, MI: Michigan State University Press.
3. Chaucer, G. 1987. The Riverside Chaucer, ed. L.D. Benson. Oxford, UK: Oxford University Press.
4. Hoccleve, T. 2001. My Compleinte and Other Poems, ed. R. Ellis. Exeter Medieval Texts and Studies. Exeter, UK: University of Exeter Press.
5. Horowitz, G.M. 2001. Sustaining Loss: Art and Mournful Life. Stanford, CA: Stanford University Press.