Jervise, A. “Notices Descriptive of the Localities of Certain Sculptured Stone Monuments in Forfarshire, Viz., - Benvie, and Invergowrie; Strathmartin, and Balutheran; Monifieth; Cross of Camus, and Arbirlot. Part III”. Proceedings of the Society of Antiquaries of Scotland, Vol. 2, Nov. 1859, pp. 442-5, doi:10.9750/PSAS.002.442.452.