BARBOUR, James. 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, [S. l.], v. 33, p. 219–243, 1899. DOI: 10.9750/PSAS.033.219.243. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6740. Acesso em: 6 may. 2024.