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WikiPedia: Richard Plantagenet, Công tước thứ 3 xứ York https://vi.wikisource.org/wiki/Richard_(1411-1460)... http://www.oxforddnb.com/view/article/23502 http://www.oup.com/oxforddnb/info/freeodnb/librari... https://archive.org/details/bosworthfieldwar0000ro... https://archive.today/20180716013752/http://www.ox... http://www.oxforddnb.com/view/10.1093/ref:odnb/978... https://vi.wikisource.org/wiki/1911_Encyclop%C3%A6... https://vi.wikisource.org/wiki/1911_Encyclop%C3%A6... https://archive.org/stream/bub_gb_4cYJAAAAIAAJ#pag... https://erenow.com/postclassical/lancasterandyork/