http://china.mrdonn.org/slavery.html
https://www.mindmeister.com/107721207/ancient-chinese-slaves
See through history ancient china by Brian Williams (book)
https://prezi.com/zpset9zp5k1y/ancient-chinese-slaves/
http://www.zum.de/whkmla/sp/0910/hersheys/hersheys5.html
Discoveries ancient china (book)
https://www.mindmeister.com/107721207/ancient-chinese-slaves
See through history ancient china by Brian Williams (book)
https://prezi.com/zpset9zp5k1y/ancient-chinese-slaves/
http://www.zum.de/whkmla/sp/0910/hersheys/hersheys5.html
Discoveries ancient china (book)