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WikiPedia: Cừu_Jacob http://books.google.com/?id=80eYTaMcPGMC&printsec=... http://books.google.com/?id=S4_yPQAACAAJ&dq=%22She... http://books.google.com/?id=igG2heYyjEUC&pg=PA18&l... http://jacob.sheepregistry.com/ http://www.eaap.org/Previous_Annual_Meetings/2008V... http://www.jacobsheepconservancy.org http://www.jsba.org http://www.jacobsheepsociety.co.uk/ http://thvl.vn/?p=637142 https://web.archive.org/web/20120323144033/http://...