- http://rivervalleycivilizations.com/indus.php
- http://www.angelfire.com/nt/Gilgamesh/achieve.html
- http://www.ducksters.com/history/china/geography_of_ancient_china.php
- http://www.historyforkids.org/learn/china/economy/
- http://www.ancientmilitary.com/ancient-china-government.htm
- Salter, Christopher L. Eastern Hemisphere. Austin, Texas: Holt, Rinehart and Winston, 2007. Print.