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worldcat.org
Linforth, Ivan M. (1941) The Arts of Orpheus Arno Press, New York, OCLC514515
Long, Herbert S. (1948) A Study of the doctrine of metempsychosis in Greece, from Pythagoras to Plato (Doktoriga disertacio de 1942 de Long) Princeton, New Jersey, OCLC1472399