FARRER, James. Note of Excavations in Sanday, one of the North Isles of Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 7, p. 398–401, 1867. DOI: 10.9750/PSAS.007.398.401. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5347. Acesso em: 3 may. 2024.