CALLANDER, J Graham. Notes on (1) Certain Prehistoric Relics from Orkney, and (2) Skara Brae: Its Culture and its Period. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 65, p. 78–114, 1931. DOI: 10.9750/PSAS.065.78.114. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7811. Acesso em: 24 apr. 2024.