ROBERTSON, Thomas S. Notes from Kirkwall. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 35, p. 313–315, 1901. DOI: 10.9750/PSAS.035.313.315. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6814. Acesso em: 24 apr. 2024.