GEDDES, Jane. The earliest portrait of St Columba: Cod Sang 555, p 166. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 147, p. 127–145, 2018. DOI: 10.9750/PSAS.147.1245. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/10108. Acesso em: 19 apr. 2024.