Maxwell, Herbert Eustace. “Notice of Further Excavation of St Ninian’s Cave, Parish of Glasserton, Wigtownshire”. Proceedings of the Society of Antiquaries of Scotland 21 (November 30, 1887): 137–141. Accessed November 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/6229.