BARCLAY, Gordon J; HALLIDAY, Stratford P. A rock-carving from Westerton, Angus district. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 112, p. 561–563, 1983. DOI: 10.9750/PSAS.112.561.563. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9100. Acesso em: 25 apr. 2024.