1. Information System,1992
2. World Declaration on the Survival, Protection and Development of Children and Plan of Action for Implementing the World Declaration on the Survival Protection and Development of Children in the 1990s;World Summit for Children,1990
3. Information System,1992
4. Sampling Techniques;Cochran,1978
5. A simplified general method for cluster-sample surveys of health in developing countries;Bennett;World Health Star Q.,1991