Héraclius de Gramont, 9th Duke of Gramont (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Héraclius de Gramont, 9th Duke of Gramont" in English language version.

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3^rd place

books.google.com

of), Melville Amadeus Henry Douglas Heddle de La Caillemotte de Massue de Ruvigny Ruvigny and Raineval (9th marquis (1914). The Titled Nobility of Europe: An International Peerage, Or "Who's Who", of the Sovereigns, Princes and Nobles of Europe. Harrison & Sons. p. 913. Retrieved 29 June 2020.{{cite book}}: CS1 maint: numeric names: authors list (link)
Richard Robert Madden (1855). Title The literary life and correspondence of the Countess of Blessington. Vol. 2 (2 ed.). T. C. Newby.