SIMPSON, D D A; MURPHY, Eileen M; GREGORY, Richard A; MCCARTNEY, M. Excavation at Orquil souterrain, St Ola, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 137, p. 169–178, 2008. DOI: 10.9750/PSAS.137.169.178. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9696. Acesso em: 26 apr. 2024.