An Inventory of the Historical Monuments in Westmorland. Originally published by His Majesty's Stationery Office, London, 1936.
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'Plan 1: Appleby Castle', in An Inventory of the Historical Monuments in Westmorland, (London, 1936) pp. . British History Online https://www.british-history.ac.uk/rchme/westm/plan-1 [accessed 25 April 2024]