SMITH, John Alexander. Notes of Small Ornamented Stone Balls found in different parts of Scotland, &c., with Remarks on their supposed Age and Use. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 11, p. 29–62, 1875. DOI: 10.9750/PSAS.011.29.62. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5729. Acesso em: 17 jun. 2024.