Adamnan. (1874) Life of Saint Columba, Founder of Hy. edmonston & Douglas, Edinburgh, UK.
McNeill, F. Marion (1920) Iona: A HIstory of the Island. Lochar Publishing Ltd, Scotland.
Owen, Alex (2004) The Place of Enchantment: British Occultism and the Culture of the Modern. The University of Chicago Press, Chicago, USA.
Tyler, Mac (1928) The Use of Imagination in Art, Science and Business. The Occult Review v48 n1 Jul 1928.
Fortune, Dion. (1930) Psychic Self Defence. The Classic Instruction Manual for ProtectingYourself Against Paranormal Attack. Weiser Books, UK.
Aberdeen Press & Journal (1929) The Iona Tragedy. Aberdeen Press & Journal, Mon 25 Nov, 1929, P.4. Scotland, UK.
The Scotsman (1929) Iona Mystery. The Scotsman. Wed, 27 Nov, 1929, P.10. Scotland, UK.