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 43: Layerthorpe Postern and Towers 34 and 33', 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-43 [accessed 1 February 2025].
'Plate 43: Layerthorpe Postern and Towers 34 and 33', 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-43.
"Plate 43: Layerthorpe Postern and Towers 34 and 33". 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-43.