WISE, T A. Notice of the outfort on Barry Hill, Forfarshire recently removed. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 2, p. 70–71, 1856. DOI: 10.9750/PSAS.002.70.71. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/4393. Acesso em: 6 may. 2024.