PETRIE, George. Notice of Ruins of Ancient Dwellings at Skara, Bay of Skaill, in the Parish of Sandwich, Orkney, recently excavated. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 7, p. 201–219, 1867. DOI: 10.9750/PSAS.007.201.219. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5324. Acesso em: 26 apr. 2024.