BRUCE, John. Notice of a Cup and Ring-marked Boulder, recently discovered on the Braid Hills. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 31, p. 110–112, 1897. DOI: 10.9750/PSAS.031.110.112. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6653. Acesso em: 8 may. 2024.