Carmichael, Alex. “Notices of Teampull Michael, Keallun, North Uist, and of Sculptured Stones in Bearnarey, Harris, and in Benbecula; An "Abrach" Quern, and Quarry for Querns, Heisgeir, North Uist. &c”. Proceedings of the Society of Antiquaries of Scotland 8 (November 30, 1871): 276-286. Accessed March 21, 2023. http://journals.socantscot.org/index.php/psas/article/view/5424.