“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”. 1871. Proceedings of the Society of Antiquaries of Scotland 8 (November): 276-86. https://doi.org/10.9750/PSAS.008.276.286.