“Notes on the Old Crosskirk at Quendale in Dunrossness, Shetland, and Its Monumental Stones”. Proceedings of the Society of Antiquaries of Scotland 41 (November 30, 1907): 173–180. Accessed September 30, 2025. https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/7082.