An Inventory of the Historical Monuments in City of York, Volume 2, the Defences. Originally published by Her Majesty's Stationery Office, London, 1972.
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'Plate 2: York Castle, Clifford's Tower and Castlegate Poster. Motte and Clifford's Tower', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences(London, 1972), British History Online https://prod.british-history.ac.uk/rchme/york/vol2/plate-2 [accessed 1 February 2025].
'Plate 2: York Castle, Clifford's Tower and Castlegate Poster. Motte and Clifford's Tower', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences(London, 1972), British History Online, accessed February 1, 2025, https://prod.british-history.ac.uk/rchme/york/vol2/plate-2.
"Plate 2: York Castle, Clifford's Tower and Castlegate Poster. Motte and Clifford's Tower". An Inventory of the Historical Monuments in City of York, Volume 2, the Defences. (London, 1972), British History Online. Web. 1 February 2025. https://prod.british-history.ac.uk/rchme/york/vol2/plate-2.