SMALL, Alan. Excavations at Underhoull, Unst, Shetland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 98, p. 225–248, 1967. DOI: 10.9750/PSAS.098.225.248. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8682. Acesso em: 26 apr. 2024.