Smith, J. A. (1867) “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, 7, pp. 334–357. doi: 10.9750/PSAS.007.334.357.