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Richard Nixon Richard I của Anh Richard Feynman Richarlison Richard II của Anh Richard Wagner Richard Linklater Richard Burton Richard Ramirez Richard ClaydermanTài liệu tham khảo
WikiPedia: Richard_Nixon //nla.gov.au/anbd.aut-an35388842 http://www.csmonitor.com/USA/DC-Decoder/Decoder-Wi... http://books.google.com/?id=PAEwuLjQm4gC http://books.google.com/?id=TP4g-RhUJmcC http://books.google.com/?id=Uw8_HAAACAAJ http://books.google.com/?id=mtya18oC2EMC&pg=PA165&... http://books.google.com/?id=r2qRyBmB15EC&pg=PA180&... http://books.google.com/?id=xahIAOPX8JwC http://books.google.com/?id=xahIAOPX8JwC&lpg=PA205... http://books.google.com/books?id=Q1V3AAAAMAAJ&dq