Curle, J. (1914) “On recent Scandinavian Grave-finds from the Island of Oronsay, and from Reay, Caithness, with Notes on the Development and Chronology of the Oval Brooch of the Viking Time”, Proceedings of the Society of Antiquaries of Scotland, 48, pp. 292–315. doi: 10.9750/PSAS.048.292.315.