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Manas, John Helen, Divination, ancient and modern, New York, Pythagorean Society, 1947. Petrakos, B. Delph, Athens 1977 Plutarch "Lives" Rohde, Erwin, Psyche, 1925. Seyffert, Oskar, "Dictionary of Classical Antiquities" , London: W. Glaisher, 1895. Spiller, Henry A., John R. Hale, and Jelle Z. de Boer. "The Delphic Oracle: A Multidisciplinary Defense of the Gaseous Vent Theory" Clinical Toxicology 40.2 (2000) 189–196. West, Martin Litchfield, The Orphic Poems, 1983. .