RITCHIE, Anna et al. Excavation of a Neolithic farmstead at Knap of Howar, Papa Westray, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 113, p. 40–121, 1984. DOI: 10.9750/PSAS.113.40.121. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9119. Acesso em: 19 apr. 2024.