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Tài liệu tham khảo WikiPedia: John_C._Calhoun http://www.amazon.com/dp/0895261790 http://www.history.com/this-day-in-history/calhoun... http://www.questia.com/read/106760073?title=Calhou... http://media.clemson.edu/library/special_collectio... http://www.sc.edu/uscpress/1993older/calhoun.html http://teachpol.tcnj.edu/amer_pol_hist/fi/000000b1... http://teachpol.tcnj.edu/amer_pol_hist/fi/000000b2... http://teachpol.tcnj.edu/amer_pol_hist/fi/000000b3... http://xroads.virginia.edu/~CAP/CALHOUN/2Ahed.html http://bioguide.congress.gov/scripts/biodisplay.pl...
