[1]
Christison, D. 1899. Account of the Excavation of the Camps and Earthworks at Birrenswark Hill in Annandale, undertaken by the Society in 1898: (I) General History of the Place. Proceedings of the Society of Antiquaries of Scotland. 33, (Nov. 1899), 198–218. DOI:https://doi.org/10.9750/PSAS.033.198.218.