CHRISTISON, David. Notes on Cup-Marked Stones in Peeblesshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 23, p. 140–142, 1889. DOI: 10.9750/PSAS.023.140.142. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6322. Acesso em: 2 may. 2024.