Boyd, D.A. and Smith, J. 1887. Notice of a Rock Surface with Cup-Marks and other Sculpturings, at Blackshaw, West Kilbride, Ayrshire. Proceedings of the Society of Antiquaries of Scotland. 21, (Nov. 1887), 143–151. DOI:https://doi.org/10.9750/PSAS.021.143.151.