Dockrill, S.J. et al. 2007. Time and place: a new chronology for the origin of the broch based on the scientific dating programme at the Old Scatness Broch, Shetland. Proceedings of the Society of Antiquaries of Scotland. 136, (Nov. 2007), 89–110. DOI:https://doi.org/10.9750/PSAS.136.89.110.