Callander, J. 1916. “Notice of (1) Three Stone Cups Found in a Cairn in Aberdeenshire, and (2) a Short Cist Containing a Beaker Urn Found at Boglehill Wood, Longniddry, East Lothian”. Proceedings of the Society of Antiquaries of Scotland 50 (November):145-51. https://doi.org/10.9750/PSAS.050.145.151.