GILBERT, John M. Crossbows on Pictish stones. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 107, p. 316–317, 1978. DOI: 10.9750/PSAS.107.316.317. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8949. Acesso em: 26 apr. 2024.