Notes on some Stone Circles in Central Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 51, p. 30–47, 1917. DOI: 10.9750/PSAS.051.30.47. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/7406. Acesso em: 26 oct. 2025.