Cursiter, James W. 1908. “Notices (1) of a Bronze Dagger, With Its Handle of Horn, Recently Found in the Island of Rousay; And (2) of an Inscription in Tree-Runes, Recently Discovered on a Stone in the Stone Circle of Stennis, Orkney”. Proceedings of the Society of Antiquaries of Scotland 42 (November):74-78. https://doi.org/10.9750/PSAS.042.74.78.