1. Protecting the world’s children: the story of WHO’s immunization programme.;Bland;World Health Forum,1998
2. World Health Organization. Global Vaccine Action Plan: 2011–2020. Geneva, Switzerland: WHO Press; 2013. http://www.who.int/immunization/global_vaccine_action_plan/en/
3. World Health Organization. WHO recommendations for routine immunization—summary tables. Geneva, Switzerland: World Health Organization; 2015. http://www.who.int/immunization/policy/immunization_tables/en/
4. Gavi, the Vaccine Alliance. Keeping children healthy: the Vaccine Alliance Progress Report 2015. Geneva, Switzerland: Gavi, the Vaccine Alliance; 2015. http://www.gavi.org/progress-report/
5. World Health Organization. Immunization Vaccines and Biologicals Database, September 2016. Geneva, Switzerland: World Health Organization; 2016. http://www.who.int/immunization/monitoring_surveillance/data/en/