CHRISTISON, David. On the Standing Stones and Cup-marked Rocks, etc., in the Valley of the Add and some neighbouring Districts of Argyle. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 38, p. 123–148, 1904. DOI: 10.9750/PSAS.038.123.148. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6974. Acesso em: 12 apr. 2024.