 cultural-china.com.Retrieved on 2008-08-03
 It is recorded in the "Classic of Rites" that the earthenware coffins were used in the time of legendary period, the tradition of burying in pottery urns lasted until the Han Dynasty (202 BC–220 AD) when it gradually disappeared.Inventions which made their first appearance in China after the Neolithic age, specifically during and after the Shang Dynasty ("c".