GRAHAM, Angus. Heriot’s Dyke. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 95, p. 227–240, 1964. DOI: 10.9750/PSAS.095.227.240. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8633. Acesso em: 20 apr. 2024.