Ferguson, Richard S. “Notice of a Penannular Brooch of Silver, With Ends Like Thistle-Heads, Found at Casterton, Kirkby Lonsdale, Westmoreland”. Proceedings of the Society of Antiquaries of Scotland 21 (November 30, 1887): 141–142. Accessed April 23, 2024. https://journals.socantscot.org/index.php/psas/article/view/6230.