^Youngs, Susan, ed. (1989). "The Work of Angels": Masterpieces of Celtic Metalwork, 6th-9th centuries AD. London:
British Museum Press. p. 92.
ISBN0-7141-0554-6.
^"Annual Meeting of the Yorkshire Philosophical Society and Opening of the New Museum". Yorkshire Gazette. 1830-02-06. p. 2.
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