WICKHAM-JONES, Caroline R; COLLINS, G H. The sources of flint and chert in northern Britain. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 109, p. 7–21, 1980. DOI: 10.9750/PSAS.109.7.21. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8990. Acesso em: 18 jul. 2024.