BOYD, D A; SMITH, J. Notice of a Rock Surface with Cup-Marks and other Sculpturings, at Blackshaw, West Kilbride, Ayrshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 21, p. 143–151, 1887. DOI: 10.9750/PSAS.021.143.151. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6231. Acesso em: 20 apr. 2024.