CLOUSTAN, Robert Stewart. Notice of the Excavation of a Chambered Cairn of the Stone Age, at Unstan, in the Loch of Stennis, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 19, p. 341–351, 1885. DOI: 10.9750/PSAS.019.341.351. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6159. Acesso em: 8 may. 2024.