Stuart, John. “Notice of the Church of St Congan at Turriff, in Aberdeenshire, and of a Fresco of St Ninian Discovered in It in December 1861”. Proceedings of the Society of Antiquaries of Scotland 6 (November 30, 1865): 427–433. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/5213.