Aspects of the architectural history of Kirkwall Cathedral. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 127, p. 855–888, 1998. DOI: 10.9750/PSAS.127.855.888. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/9988. Acesso em: 1 oct. 2025.