HIBBERT, Samuel. Observations on the Theories which have been proposed to explain the Vitrified Forts of Scotland. Archaeologia Scotica, [S. l.], v. 4, p. 160–182, 1858. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/274. Acesso em: 3 may. 2024.