Rees, Thomas, J Barber, M Dalland, A Duffy, T Holden, A MacSween, and K McSweeney. 1998. “The Excavation of Cairnwell Ring-Cairn, Portlethen, Aberdeenshire”. Proceedings of the Society of Antiquaries of Scotland 127 (November):255-79. https://doi.org/10.9750/PSAS.127.255.279.