Jervise, Andrew. “Account of the Excavation of the Round or ’Bee-hive’ Shaped House, and Other under-Ground Chambers, at West Grange of Conan, Forfarshire”. Proceedings of the Society of Antiquaries of Scotland, vol. 4, Nov. 1863, pp. 492-9, doi:10.9750/PSAS.004.492.499.