References for Hon. Katherine Manners

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Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
M.A.H., Marquis de Ruvigny: The Plantagenet roll of the blood royal, ? Volume. 1905/1908
K.Schürer: Line from Anne York to Michael Ibsen. Univesity of Leicester, Richard III descendance project, 2015