CALLANDER, J Graham. Bronze Age urns of clay from Orkney and Shetland, with a note on vitreous material called ’cramp’. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 70, p. 441–452, 1936. DOI: 10.9750/PSAS.070.441.452. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7995. Acesso em: 2 may. 2024.