Barber, J., A. Duffy, J. O’Sullivan, K. McSweeny, C. Mills, and T. O’Sullivan. “The Excavation of Two Bronze Age Burial Cairns at Bu Farm, Rapness, Westray, Orkney”. Proceedings of the Society of Antiquaries of Scotland, Vol. 126, Nov. 1997, pp. 103-20, doi:10.9750/PSAS.126.103.120.