GRAHAM, Angus. Cultivation terraces in South-eastern Scotland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 73, p. 289–315, 1939. DOI: 10.9750/PSAS.073.289.315. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8115. Acesso em: 19 apr. 2024.