2Park, Chai Bin and Cho, Nam - Hoon. 1995. Consequence of son preference in a low - feaility society: imbalance of the sex ratio at birth in Korea. Population and Development Review,Vol.21, No.1:59-84.
3Sheps, Mindel C.1963. Effects on family size and sex ratio of preferences regarding the sex of children, Population Studies, Vol.17:66-72.
4UN Department of Economic and Social Affairs Population Division.2003. World population prospects: the 2002 revision (Vol. 1 comprehensive tables), New York: United Nations.