CHRISTISON, David. Forts on Whitcastle Hill, Upper Teviotdale; and Earthwork on Flanders Moss, Menteith. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 40, p. 15–22, 1906. DOI: 10.9750/PSAS.040.15.22. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7045. Acesso em: 28 apr. 2024.