Neish, James. “Notes of Stone Celts Found in Glenshee, Forfarshire, 1870; And of Clay Cones (Loom Weights) Found at Ravensby, Parish of Barrie, Forfarshire”. Proceedings of the Society of Antiquaries of Scotland, vol. 9, Nov. 1871, pp. 174-6, doi:10.9750/PSAS.009.174.176.