NICOLSON, John. The Exploration of the Site known as the Kirk Stones of Stroupster, in the Parish of Wick, County of Caithness. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 50, p. 314–316, 1916. DOI: 10.9750/PSAS.050.314.316. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7394. Acesso em: 22 nov. 2024.