MacKie, Euan W. (December 1965). "The Origin and Development of the Broch and Wheelhouse Building Cultures of the Scottish Iron Age". Proceedings of the Prehistoric Society. 31. Cambridge University Press (CUP): 93–146. doi:10.1017/s0079497x00014742. ISSN0079-497X. S2CID164050601.
MacKie, Euan W. (December 1965). "The Origin and Development of the Broch and Wheelhouse Building Cultures of the Scottish Iron Age". Proceedings of the Prehistoric Society. 31. Cambridge University Press (CUP): 93–146. doi:10.1017/s0079497x00014742. ISSN0079-497X. S2CID164050601.
MacKie, Euan W. (December 1965). "The Origin and Development of the Broch and Wheelhouse Building Cultures of the Scottish Iron Age". Proceedings of the Prehistoric Society. 31. Cambridge University Press (CUP): 93–146. doi:10.1017/s0079497x00014742. ISSN0079-497X. S2CID164050601.
Dockrill, S. J., Outram, Z. and Batt, C. M. (2006) Time and place: a new chronology for the origin of the broch based on the scientific dating programme at the Old Scatness Broch, Shetland, PSAS, v. 136, pp. 89-110; ISSN0081-1564