Jervise, Andrew. 1859. “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 2 (November), 442-52. https://doi.org/10.9750/PSAS.002.442.452.