Barbour, J. (1899) “Account of the Excavation of the Camps and Earthworks at Birrenswark Hill in Annandale, undertaken by the Society in 1898: (II) Account of the Excavations at Birrenswark and Description of the Plans and Sections”, Proceedings of the Society of Antiquaries of Scotland, 33, pp. 219–243. doi: 10.9750/PSAS.033.219.243.