<b>LEO CITES:
</b>
Debrett's Kings and Queens of Europe, London, 1988 , Williamson, David, Reference: 45 bio
Europäische Stammtafeln, J.A. Stargardt Verlag, Marburg, Schwennicke, Detlev (Ed.), Reference: vol III/1 page 126.
The Plantagenet Encyclopedia, London, 1990 , Hallam, Elizabeth; General Editor, Reference: 17 bio
Europäische Stammtafeln, Band II, Frank Baron Freytag von Loringhoven, 1975, Isenburg, W. K. Prinz von, Reference: Page 48
The Ancestry of Elizabeth of York, 1999 , Lewis, Marlyn, Reference: 68
Genealogisches Handbuch des Adels, Fürstliche Häuser , Reference: 1968