51Hutton, Ronald. The Pagan Religions of the Ancient British Isles: Their Nature and Legacy. Oxford, UK: B. Blackwell, 1991. 118-124.
The author states, ""During the last twenty years thousands of hitherto unsuspected prehistoric monuments have been rediscovered by means of geophysical surveys and aerial photography. Not one has been found by all the psychics and dowsers who abound in 'alternative' archaeology.'"