CALLANDER, J Graham; GRANT, Walter G. The Broch of Midhowe, Rousay, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 68, p. 444–516, 1934. DOI: 10.9750/PSAS.068.444.516. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7924. Acesso em: 2 may. 2024.