websites: http://www.chinaknowledge.de/History/Zhou/zhou.html
http://www.mnsu.edu/emuseum/prehistory/china/ancient_china/zhou.html
http://library.thinkquest.org/12255/library/dynasty/zhou.html
http://www.ehow.com/list_7462115_zhou-dynasty-inventions.html
Book:
The Story of Ancient China
Book section:
Zhou dynasty
