Smith, J.A. 1873. Notes on the Ancient Cattle of Scotland: I. The Small Short-horned Ox, Bos Longifrons, Owen; II. The Great Long-horned Ox; the Urus, Bos Primigenius, Bojanus and Owen. Proceedings of the Society of Antiquaries of Scotland. 9, (Nov. 1873), 587–674. DOI:https://doi.org/10.9750/PSAS.009.587.674.