Bevan, Edwyn Robert
Sibyls and Seers; A Survey of Some Ancient Theories of Revelation and Inspiration
Curnow, Trevor
The Oracles of the Ancient World
Flaceliere, Robert
Greek Oracles
Fontenrose, Joseph
The Delphic Oracle; Its Response and Origins
MacDermot, Violet
The Cult of the Seer in the Ancient Middle East
Parke, H.W.
Greek Oracles
Temple,Robert K.G.
The Sirius Mystery