Heath B.Chamberlain, On the Search for Civil Society in China.Modern China. vol.19, no.2(April1993)pp.199-215.
R.S.Schfield,The Impact of Scarcity and Plenty on Population Change in England. In R.I.Rotberg and T. K.Rabb(eds.).Hunger and History:The Impact ofChanging Food Production and Consumption Pattern on SocietCambridge:Cambridge University Press1983. p.79.