Notice of a Group of Long Graves, Stone-lined, near the source of the Water of North Esk. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 40, p. 60–76, 1906. DOI: 10.9750/PSAS.040.60.76. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/7050. Acesso em: 28 oct. 2025.