Oracle sites and Future Visions
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

Martin Gray is a cultural anthropologist, writer and photographer specializing in the study of pilgrimage traditions and sacred sites around the world. During a 40 year period he has visited more than 2000 pilgrimage places in 165 countries. The World Pilgrimage Guide at sacredsites.com is the most comprehensive source of information on this subject.