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, (Nov. 1904), 487–505. DOI:https://doi.org/10.9750/PSAS.038.487.505.