Kastilyalı İzabella (ing. Isabella of Castile; 1355[1], Tordesilyas[d], Kastiliya və Leon – 23 dekabr 1392[1]) — Kastiliya kralı I Pyotrun və xanımı Mariya Padillanın qızı. Bacısı Konstansanın İngiltərə kralı III Eduardın oğlu Gentli Conla evlənməsinin ardından İzabella da, kralın digər oğlu Edmond Lanqli ilə evləndirildi.
- Cokayne, George Edward (1959). The Complete Peerage, edited by Geoffrey H. White. XII(2). London: St. Catherine Press.
- Harriss, G.L. (2004). Richard, earl of Cambridge (1385–1415). Oxford Dictionary of National Biography. Retrieved 4 October 2012. (subscription required)
- Horrox, Rosemary (2004). Edward, second duke of York (c.1373–1415). Oxford Dictionary of National Biography. Retrieved 18 October 2012.
- Pugh, T.B. (1988). Henry V and the Southampton Plot of 1415. Alan Sutton. ISBN 0-86299-541-8
- Richardson, Douglas (2011). Magna Carta Ancestry: A Study in Colonial and Medieval Families, ed. Kimball G. Everingham. II (2nd ed.). Salt Lake City. ISBN 1-4499-6638-1
- Tait, James (1896). 'Plantagenet', Edward. 45. Dictionary of National Biography, 1885–1890. pp. 401–4. Retrieved 20 October 2012.
- Tuck, Anthony (2004). Edmund , first duke of York (1341–1402). Oxford Dictionary of National Biography. Retrieved 18 October 2012.
- Weir, Alison (2011). Britain's Royal Families: The Complete Genealogy. London.ISBN 1446449114, 9781446449110.
- Works related to Edward of Langley, 2nd Duke of York at Wikisource: Dictionary of National Biography, 1885–1900, Volume 45