Sobre a relação problemática entre enxoval funerário e escatologia, ver Ian Morris, Death-ritual and Social Structure in Classical Antiquity (Cambridge University Press, 1992) pp. 17–18.
Radcliffe G. Edmonds, III, Myths of the Underworld Journey: Plato, Aristophanes, and the 'Orphic' Gold Tablets (Cambridge University Press, 2004), limited preview here.