1. Beck, T., Clarke, G., Groff, A., Keefer, P., & Walsh, P. (2000). New tools and new tests in comparative political economy: the database of political institutions. Policy Research Working Paper 2283: World Bank, Development Research Group, Washington, DC
2. A simplified general method for cluster-sample surveys of health in developing countries;Bennett;World Health Statistics Quarterly,1991
3. When cure is better than prevention: immunity and preventive care of measles;Bishit;Economic and Political Weekly,2000
4. Boerma, H. T., Sommerfelt, A. E., Rutstein, S. O., & Rojas, G. (1990). Immunization: levels, trends and differentials. DHS comparative studies, No. 1. Columbia, MD: Institute for Resource Development
5. Boerma, J. T. & Bicego, G. T. (1993). The quality of data on child immunization in DHS-I surveys. Chapter 4. Macro International Inc. 1993: An Assessment of the Quality of Health Data in DHS-I Surveys. (DHS) Methodological Reports, No. 2. Calverton, MD: Macro International Inc