Oxford Dictionary of National Biography
H. C. G. Matthew, Campbell, George Douglas, eighth duke of Argyll in the peerage of Scotland, and first duke of Argyll in the peerage of the United Kingdom (18231900), first published 2004; online edn, May 2009, 4620 words, with portrait illustration
http://dx.doi.org/10.1093/ref:odnb/4500
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