“Excavations of Three Neolithic Chambered Cairns – One With an Upper and a Lower Chamber – in the Islands of Eday and the Calf of Eday in Orkney: Including Report on the Pottery”. 1938. Proceedings of the Society of Antiquaries of Scotland 72 (November): 193-213. https://doi.org/10.9750/PSAS.072.193.213.