Cursiter, J. 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, 74–78. https://doi.org/10.9750/PSAS.042.74.78