LIDDEL, Peter. Note of an Underground Structure at Gress, near Stornoway, and other Ancient Remains in the Island of Lewis. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 10, p. 741–744, 1875. DOI: 10.9750/PSAS.010.741.744. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5710. Acesso em: 31 oct. 2024.