Butler Arms of England, Ireland, and Wales
William Henry Butler, Esq., J.P. co. Gloucester. Born June 26, 1850. (Amorial Families, Arthur Charles Fox-Davies, 1902).
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Irish Families Their Names, Arms and Origins, Edward MacLysaght, (formerly Chief Herald of Ireland) Dublin, 1972.
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The Dictionary of Heraldry Feudal Coats of Arms and Pedigrees, Joseph Foster, 1989.