1. Vaccines and Immunizationhttps://www.who.int/health-topics/vaccines-and-immunization#tab=tab_1
2. Preventing Disease through Healthy Environments: Towards an Estimate of the Environmental Burden of Disease;Prüss-Üstün,2006
3. Immunization, Vaccines, and Biologicals: The Middle-Income Country Strategyhttp://www.who.int/immunization/programmes_systems/sustainability/mic_strategy/en/
4. WHO’s Vision and Mission in Immunization and Vaccines 2015–2030http://www.who.int/immunization/documents/general/WHO_Mission_VIsion_Immunization_Vaccines_2015_2030.pdf?ua=1
5. Global Vaccine Action Plan 2011–2020http://www.who.int/immunization/global_vaccine_action_plan/GVAP_doc_2011_2020/en/