CARD, Nick; ALLDRITT, D; CLARK, A; DUNCAN, J; MACSWEEN, A; MILLER, J; RAMSAY, S; WICKHAM-JONES, C R. Excavation of Bookan chambered cairn, Sandwick, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 135, p. 163–190, 2006. DOI: 10.9750/PSAS.135.163.190. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9647. Acesso em: 8 dec. 2024.