Petrie, George, and James Farrer. “Notice of a Barrow at Huntiscarth in the Parish of Harray, Orkney, Recently Opened”. Proceedings of the Society of Antiquaries of Scotland 3 (November 30, 1862): 195. Accessed April 24, 2024. https://journals.socantscot.org/index.php/psas/article/view/4514.