Belsey, Catherine (1992). “Making History”. Trong Holderness, Graham (biên tập). Shakespeare's history plays: Richard II to Henry V. Macmillan. ISBN0333549023.
Brewer, DS (2012). John Gower, Poetry and Propaganda in Fourteenth-century England . DS Brewer. ISBN978-1843843153.
Castor, Helen (2000). The King, the Crown, and the Duchy of Lancaster: Public Authority and Private Power, 1399–1461. Oxford University Press. ISBN0-19-820622-4.
Crofton, Ian (2007). The Kings and Queens of England. Quercus. ISBN978-1-84724-065-1.
Davies, Norman (1997). Europe – A History. Pimlico. ISBN0-7126-6633-8.
Davies, R R (1995). The Revolt of Owain Glyn Dwr. Oxford University Press. ISBN0-19-280209-7.
Fowler, Kenneth Alan (1969). The King's Lieutenant: Henry of Grosmont, First Duke of Lancaster, 1310–1361. Elek (Paul) (Scientific Books) Ltd. ISBN0-236-30812-2.
Mortimer, Ian (2012). Medieval Intrigue: Decoding Royal Conspiracies. Continuum. ISBN978-1441102690.
Palmer, J. J. N. (1974). “The historical context of the Book of the Duchess: a revision”. Chaucer Review. 8: 253–61.
Pinches, John Harvey; Pinches, Rosemary (1974). The Royal Heraldry of England. Heraldry Today. Slough, Buckinghamshire: Hollen Street Press. ISBN0-900455-25-X.