Bryce, T. and Low, A. (1905) “Notes (I) on a Human Skeleton found in a Cist with a Beaker Urn at Acharole, West Watten, Caithness; and (II) on the Cranial Form associated with that type of Ceramic”, Proceedings of the Society of Antiquaries of Scotland, 39, pp. 418-438. doi: 10.9750/PSAS.039.418.438.