Tolong jelaskan mengenai Sumber modern dari Pithia

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de Boer, Jelle Zeilinga, Jeffrey P. Chandon, John Rigby Hale & Henry A. Spiller, "Questioning the Delphic Oracle", Scientific American (August 2003)

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West, Martin Litchfield, The Orphic Poems, Oxford: Clarendon Press ISBN 0-19-814854-2 (1983)