Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471. Originally published by His Majesty's Stationery Office, London, 1933.
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'Lateran Regesta 540: 1458', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471, ed. J A Twemlow (London, 1933), British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol12/p20 [accessed 2 May 2025].
'Lateran Regesta 540: 1458', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471. Edited by J A Twemlow (London, 1933), British History Online, accessed May 2, 2025, https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol12/p20.
"Lateran Regesta 540: 1458". Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471. Ed. J A Twemlow (London, 1933), British History Online. Web. 2 May 2025. https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol12/p20.