CURLE, Cecil L. An engraved lead disc from the Brough at Birsay, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 105, p. 301–307, 1975. DOI: 10.9750/PSAS.105.301.307. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8893. Acesso em: 26 apr. 2024.