Jervise, A. (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, 442–452. https://doi.org/10.9750/PSAS.002.442.452