SMITH, John Alexander. Additional Notes on Small Ornamented Stone Balls found in different parts of Scotland, &c. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 11, p. 313–319, 1875. DOI: 10.9750/PSAS.011.313.319. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5751. Acesso em: 25 jun. 2024.