^More nuanced recent views, based on early DNA research, are presented by the Oxford geneticist Bryan Sykes, in Blood of the Isles, 2006.
^Brief details of his career are available in the introduction to the 1997 reprint of An Encyclopaedia of Occultism (on-line text). نسخة محفوظة 03 مارس 2016 على موقع واي باك مشين.
^The Mysteries of Britain, Lewis Spence, Health Research Books, 1996, p. 21
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