Duns, P. (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, pp. 168–171. doi: 10.9750/PSAS.011.168.171.