RITCHIE, P R. Notes: (4) An earth-house at South Unigarth, Sandwick, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 92, p. 118–119, 1961. DOI: 10.9750/PSAS.092.118.119. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8582. Acesso em: 2 may. 2024.