Excavation at Black Jack Castle, Craig, Angus. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 98, p. 249–253, 1967. DOI: 10.9750/PSAS.098.249.253. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/8683. Acesso em: 1 oct. 2025.