Tham khảo John_Churchill,_Công_tước_Marlborough_thứ_nhất

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WikiPedia: John_Churchill,_Công_tước_Marlborough_thứ_nhất http://cantic.bnc.cat/registres/CUCId/a10118901 http://www.churchillbooks.com/GuidePDFs/g56.pdf http://www.churchillbooks.com/GuidePDFs/g82.pdf http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://data.bibliotheken.nl/id/thes/p070527423 http://www.biografischportaal.nl/en/persoon/096356... http://www.basilica.org/pages/ebooks/G.K.Chesterto... http://mak.bn.org.pl/cgi-bin/KHW/makwww.exe?BM=1&N... http://books.google.com.tw/books?id=MrDcAIvc9YwC&p... https://trove.nla.gov.au/people/913485