GOUDIE, Gilbert. The Danish Claims upon Orkney and Shetland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 21, p. 236–251, 1887. DOI: 10.9750/PSAS.021.236.251. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6244. Acesso em: 26 apr. 2024.