Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 13, 1471-1484. Originally published by Her Majesty's Stationery Office, London, 1955.
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'Vatican Regesta 570: 1474-1476', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 13, 1471-1484, (London, 1955) pp. 42-43. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol13/pp42-43 [accessed 24 April 2024]