1) D,Lina."Han Dynasty Achievements"<http://socyberty.com/history/han-dynasty-achievements/>, February 26,2013
2)TCI. History Alive! The Ancient World. Palo Alto: TCI, 2011.
3)Kuhn,Dieter."Silk Weaving in Ancient China:From Geometric Figures to Patterns of Pictorial Likeness"<http://historyoftheancientworld.com/2010/01/silk-weaving-in-ancient-china-from-geometric-figures-to-patterns-of-pictorial-likeness/>January 26,2010
4)"The Importance of Salt"<http://mygeologypage.ucdavis.edu/cowen/~GEL115/salt.html>May,1999
2)TCI. History Alive! The Ancient World. Palo Alto: TCI, 2011.
3)Kuhn,Dieter."Silk Weaving in Ancient China:From Geometric Figures to Patterns of Pictorial Likeness"<http://historyoftheancientworld.com/2010/01/silk-weaving-in-ancient-china-from-geometric-figures-to-patterns-of-pictorial-likeness/>January 26,2010
4)"The Importance of Salt"<http://mygeologypage.ucdavis.edu/cowen/~GEL115/salt.html>May,1999