POTTER, John F. Early stone emplacement in three Scottish ecclesiastical national monuments. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 138, p. 205–221, 2009. DOI: 10.9750/PSAS.138.205.221. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9720. Acesso em: 5 may. 2024.