William George Hay, XVIII conte di Erroll (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "William George Hay, XVIII conte di Erroll" in Italian language version.

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Eton College, Henry Edward Chetwynd Stapylton, The Eton school lists, from 1791 to 1850: every third year after 1793, with notes, E. P. Williams, 1863, p. 87.
Edmund Lodge, Anne Innes, Eliza Innes, Maria Innes, The Peerage of the British Empire as at Present Existing, Saunders and Otley, 1851, p. 222.