Smith, J.A. 1878. Notice of the Horns of Cattle (the Horny Sheaths of the Horns) found in Bogs in Roxburghshire and Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland. 12, (Nov. 1878), 493–497. DOI:https://doi.org/10.9750/PSAS.012.493.497.