- [S1850] Medieval Lands: A Prosopography of Medieval European Noble and Royal Families, Charles Cawley, (http://fmg.ac/Projects/MedLands/), England, Anglo-Saxon & Danish Kings [accessed 28 Jun 2006].
- [S23] #849 Burke's Guide to the Royal Family (1973), (London: Burke's Peerage, c1973), FHl book 942 D22bgr., p. 190.
- [S39] Medieval, royalty, nobility family group sheets (filmed 1996), Church of Jesus Christ of Latter-day Saints. Family History Department. Medieval Family History Unit, (Manuscript. Salt Lake City, Utah : Filmed by the Genealogical Society of Utah, 1996), FHL film 1553977-1553985..
- [S22] #374 The Lineage and Ancestry of H. R. H. Prince Charles, Prince of Wales (1977), Paget, Gerald, (2 volumes. Baltimore: Geneal. Pub., 1977), FHL book Q 942 D22pg., vol. 1 p. 7.