ROBERTSON, W Norman. St John’s Cross, Iona, Argyll. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 106, p. 111–123, 1977. DOI: 10.9750/PSAS.106.111.123. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8915. Acesso em: 27 apr. 2024.