[S60] Stuart, Roderick W. Royalty for Commoners, The Complete Known Lineage of John of Gaunt, Son of Edward III, King of England, and Queen Philippa Fourth Edition, (Baltimore, Maryland: Genealogical Publishing Company, 2002).
[S1488] Barlow, Lundie W. "The Antecedents of Earl Godwine of Wessex" , (Boston: The New England Historical and Genealogical Register, volume CXI, January 1957).