More Shetland Tombstones. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 69, p. 27–48, 1935. DOI: 10.9750/PSAS.069.27.48. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/7931. Acesso em: 27 oct. 2025.