PETRIE, George. Notice of a Barrow containing Cists, on the Farm of Newbigging, near Kirkwall: and at Ibister, in the parish of Rendall, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 6, p. 411–418, 1865. DOI: 10.9750/PSAS.006.411.418. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5210. Acesso em: 29 apr. 2024.