GRAHAM-CAMPBELL, James. A lost Pictish treasure (and two Viking-age gold arm-rings) from the Broch of Burgar, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 115, p. 241–261, 1987. DOI: 10.9750/PSAS.115.241.261. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9213. Acesso em: 26 apr. 2024.