Irvine, J. T. (1898). Notes on Sepulchral Cairns discovered by the blowing of sand on the Sands of Bracon; and on the Sculptured Stone discovered at South Garth, Island of Yell, Shetland. Proceedings of the Society of Antiquaries of Scotland, 32, 171–174. https://doi.org/10.9750/PSAS.032.171.174