Card, Nick, D Alldritt, A Clark, J Duncan, A MacSween, J Miller, S Ramsay, and C R Wickham-Jones. “Excavation of Bookan Chambered Cairn, Sandwick, Orkney”. Proceedings of the Society of Antiquaries of Scotland 135 (November 30, 2006): 163–190. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/9647.