References for 2 daughters FitzRoy
Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
D.Schwennicke: Europäische Stammtafeln, Vol. III/2, Tafel 376. Marburg, 1983