Allison Weir, Britain's Royal Families: The Complete Genealogy (London: Palmico, 1996).

Britain's Royal Families: The Complete Genealogy.

Source cited by 'The Peerage.com' - Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 3.

A Weir, Britain's Royal Families - The Complete Genealogy (2002)

Weir, Alison (1996) Britain's Royal Families: The Complete Genealogy.

Britain's Royal Family: A Complete Genealogy.

Alison Weir, Britain's Royal Families: the Complete Genealogy, rev. ed.

Britain's Royal Family: A Complete Genealogy (The Bodley Head, London, 1999)

Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 230.

Britain's Royal Families: The Complete Genealogy, Revised edition.