LAMB, R G. A stack site off Stronsay, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 110, p. 517–519, 1981. DOI: 10.9750/PSAS.110.517.519. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9044. Acesso em: 7 may. 2024.