Callander, J. G. (1904). Notice of a Stone Mould for Casting Flat Bronze Axes and Bars found in the Parish of Insch, Aberdeenshire; with Notes on the occurrence of Flat Axe Moulds in Europe. Proceedings of the Society of Antiquaries of Scotland, 38, 487–505. https://doi.org/10.9750/PSAS.038.487.505