The Drostan Stone (St Vigeans). Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 43, p. 330–334, 1909. DOI: 10.9750/PSAS.043.330.334. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/7157. Acesso em: 2 oct. 2025.