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, (Nov. 1899), 219–243. DOI:https://doi.org/10.9750/PSAS.033.219.243.