Joass, J. M. (1871) “Notes of the Discovery of a Necklace of Beads and Plates of Shale and Jet, along with Flint Arrow Heads, found in a Cist under a Small Tumulus at Torrish, Kildonan, Sutherlandshire”, Proceedings of the Society of Antiquaries of Scotland, 8, pp. 408–411. doi: 10.9750/PSAS.008.408.411.