KIRKNESS, William. Notes on the Discovery of a Coped Monument and an Incised Cross-slab at the Graveyard, St Boniface Church, Papa Westray, Orkney. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 55, p. 131–134, 1921. DOI: 10.9750/PSAS.055.131.134. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7509. Acesso em: 23 apr. 2024.