SCOTT, Ian G; RITCHIE, Anna. Pictish symbol stones and early cross-slabs from Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 144, p. 169–204, 2015. DOI: 10.9750/PSAS.144.169.204. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9813. Acesso em: 4 may. 2024.