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^Alan S. Bell, (1981), The Scottish antiquarian tradition: essays to mark the bicentenary of the Society of Antiquaries of Scotland and its museum, 1780-1980, page 83. Society of Antiquaries of Scotland
^Colleen E. Batey, Judith Jesch, Christopher D. Morris, (1995), The Viking Age in Caithness, Orkney, and the North Atlantic, page 349. Edinburgh University Press