Frazer, William. “Notes on Incised Sculpturings on Stones in the Cairns of Sliabh-Na-Calliaghe, Near Loughcrew, County Meath, Ireland, With Illustrations from a Series of Ground-Plans and Water-Colour Sketches, by the Late G V Du Noyer,of the Geological Survey of Ireland”. Proceedings of the Society of Antiquaries of Scotland, vol. 27, Nov. 1893, pp. 294-40, doi:10.9750/PSAS.027.294.340.