Smith, J. A. (1874) “Notes of Rock Sculpturings of Cups and Concentric rings, and ’The Witch’s Stone’ on Tormain Hill; also of some Early Remains on the Kaimes Hill, &c., near Ratho, Edinburghshire”, Proceedings of the Society of Antiquaries of Scotland, 10, pp. 141–151. doi: 10.9750/PSAS.010.141.151.