MACDONALD, Murdo. A note on the diameters of carved stone balls. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 136, p. 75, 2007. DOI: 10.9750/PSAS.136.75. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9675. Acesso em: 27 apr. 2024.