RITCHIE, Graham; RITCHIE, Anna; DENSTON, C B. Excavation of a barrow at Queenafjold, Twatt, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 105, p. 33–40, 1975. DOI: 10.9750/PSAS.105.33.40. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8872. Acesso em: 22 nov. 2024.