1. Expanded Programme on Immunization, Global Advisory Group;World Health Organization;EPI Global Overview,1992
2. Cost-effectiveness appraisal of immunization programs;Creese;Bull. Wld Hlth Organ.,1982
3. Protecting the World's Children: Vaccines and Immunization within Primary Health Care;Rockefeller Foundation,1984
4. Selective primary health care: an interim strategy for disease control in developing countries;Walsh;Soc. Sci. Med.,1985