BOSWALL, Donaldson. Notice of an Ancient Bulwark discovered on the Sea-shore of the Lands of Wardie, near Edinburgh. Archaeologia Scotica, [S. l.], v. 4, p. 302–304, 1858. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/298. Acesso em: 24 apr. 2024.