MUNRO, Robert. Notes on a Set of Five Jet Buttons found on a hill in Forfarshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 36, p. 464–487, 1902. DOI: 10.9750/PSAS.036.464.487. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6838. Acesso em: 5 may. 2024.