SMITH, John Alexander. Notice of an Anglo-Saxon Styca of Osbercht, King of Northumbria. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 3, p. 300–303, 1862. DOI: 10.9750/PSAS.003.300.303. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/4528. Acesso em: 15 jun. 2024.