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Stansfield, Michael. The Hollands, Dukes of Exeter, Earls of Kent and Huntingdon...
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Stansfield, Michael. The Hollands, Dukes of Exeter, Earls of Kent and Huntingdon 1352-1475. Ph.D. thesis, Corpus Christi College, Oxford University, Hilary 1987, p. 19. PDF available here.