LEWIS, John. Excavations at Crichton Castle, Midlothian. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 127, p. 697–705, 1998. DOI: 10.9750/PSAS.127.697.705. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9984. Acesso em: 7 may. 2024.