“Notes on Some Prehistoric Burial-Places and Standing Stones in the Island of Yell, Shetland. (With Illustrations.)”. Proceedings of the Society of Antiquaries of Scotland 21 (November 30, 1887): 215–219. Accessed September 28, 2025. https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/6242.