Liên quan Robert Oppenheimer Robert Lewandowski Roberto Carlos Robert Downey Jr. Roberto Baggio Roberto Mancini Robert Pattinson Robert Pirès Roberto Firmino Robert Sánchez
Tài liệu tham khảo WikiPedia: Robert_Recorde http://www.oxforddnb.com/view/article/23241 http://jeff560.tripod.com/mathword.html http://jeff560.tripod.com/relation.html //doi.org/10.1093%2Fref:odnb%2F23241 http://www-groups.dcs.st-and.ac.uk/~history/Biogra... http://www.renascentbooks.co.uk/ https://books.google.com/books/about/The_urinal_of... https://archive.org/details/thenatureofmath00jouru... https://archive.org/details/worldofmathemati00newm https://archive.org/stream/TheWhetstoneOfWitte#pag...
