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 28: York and River Ouse. Postern Tower, Bootham Bar and Tower', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences, (London, 1972) pp. 28. British History Online https://www.british-history.ac.uk/rchme/york/vol2/plate-28 [accessed 24 March 2024]