GRAHAM, Angus; COLLINGWOOD, R G. Skipness Castle. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 57, p. 266–287, 1923. DOI: 10.9750/PSAS.057.266.287. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7581. Acesso em: 20 apr. 2024.