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- [S9] Oxford D.N.B., H. C. G. Matthew (ed.), (Oxford: Oxford University Press, 2004), C. Carpenter, "Edward, styled earl of Warwick (1475–1499), potential claimant to the English throne".
- [S9] Oxford D.N.B., H. C. G. Matthew (ed.), (Oxford: Oxford University Press, 2004), M. Hicks, "George, duke of Clarence (1449-1478), prince".
- [S2] BP 2003, Charles Mosley (ed.), (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd., 2003), volume 1, page 17.
- [S22] The Complete Peerage, G. E. Cokayne, with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden (eds.), (Alan Sutton Publishing, 1910–59; reprint in 6 volumes, Gloucester, 2000), volume III (1913), page 260.
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