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
Stoneman, Richard
The Ancient Oracles, Making the Gods Speak
Temple,Robert K.G.
The Sirius Mystery