SIMPSON, D D A; MURPHY, Eileen M; GREGORY, Richard A; MCCARTNEY, M. Excavation of a double cist burial from Gyre Farm, Orphir, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 137, p. 59–67, 2008. DOI: 10.9750/PSAS.137.59.67. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9695. Acesso em: 8 may. 2024.