LAING, Lloyd; LAING, Jennifer. The date and origin of the Pictish symbols. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 114, p. 261–276, 1985. DOI: 10.9750/PSAS.114.261.276. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9164. Acesso em: 3 may. 2024.