CHRISTISON, David. The Forts, ’Camps,’ and other Field-Works of Perth, Forfar, and Kincardine. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 34, p. 43–120, 1900. DOI: 10.9750/PSAS.034.43.120. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6763. Acesso em: 18 jun. 2024.