Smith, John Alexander. “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 (November 30, 1873): 587–674. Accessed November 22, 2024. https://journals.socantscot.org/index.php/psas/article/view/5547.