References for George Nassau Fuerst, 3rd Earl, Viscount, Baron v.Cowper * Cowper * of Forwich * of Wingham
J.Siebmacher:
J.Siebmachers grosses Wappenbuch, Band 3-A, Die Wappen des hohen deutschen Adels.
Neustadt a.d.Aisch, Bauer & Raspe, 1972/4