MITCHELL, Arthur. Note on Spade-like Implements of Stone. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 32, p. 30–35, 1898. DOI: 10.9750/PSAS.032.30.35. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6685. Acesso em: 25 apr. 2024.