Duns, Professor. 1875. “Notes on Some Articles Exhibited to the Meeting, Viz. – A Bronze Spear-Head, a Small Unlooped Socketed Celt, a Sword-Shaped Stone from Shetland, and a Tripod Bronze Pot”. Proceedings of the Society of Antiquaries of Scotland 11 (November):168-71. https://doi.org/10.9750/PSAS.011.168.171.