Edwards, A.J.H. and Bryce, T.H. 1926. Excavation of a number of Graves in a Mound at Ackergill, Caithness: With a Report on the Skeletal Remains from the Graves. Proceedings of the Society of Antiquaries of Scotland. 60, (Nov. 1926), 160–182. DOI:https://doi.org/10.9750/PSAS.060.160.182.