Smith, John Alexander. “Notice of a Remarkable Bronze Ornament With Horns Found in Galloway, Now at Abbotsford. Also of a Bronze Ornament, Like a ’Swine’s Head,’ Found in Banffshire”. Proceedings of the Society of Antiquaries of Scotland, vol. 7, Nov. 1867, pp. 334-57, doi:10.9750/PSAS.007.334.357.