MARSHALL, David. Notes on Drochil Castle, Peeblesshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 22, p. 125–130, 1888. DOI: 10.9750/PSAS.022.125.130. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6289. Acesso em: 7 may. 2024.