References for Muriella de Keith

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Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
Sir B. Burke: A Genealogical History of the Dormant, abeyant, forfeited and extinct peerages of the British Empire. London, 1866
W.K. v.Isenburg: Europäische Stammtafeln, Band II, Tafel 69. Marburg, 1953 (1965)
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 93. Marburg, 1984