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Stuart, J. 1865. 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, (Nov. 1865), 427–433. DOI:https://doi.org/10.9750/PSAS.006.427.433.