HUTCHESON, Alexander. Notice of a Cup-Marked Stone found at Williamston, in the Parish of St Martins, Perthshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 23, p. 142–143, 1889. DOI: 10.9750/PSAS.023.142.143. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6323. Acesso em: 20 apr. 2024.