1. World Health Organization. Global vaccine action plan 2011–2020. http://www.who.int/immunization/global_vaccine_action_plan/en/.
2. Private sector contribution to childhood immunization : Sri Lankan experience;Agampodi;Indian J Med Sci,2007
3. A high volume, use-friendly immunization clinic in Vellore, India: a model for urban hospitals;Kompithra;J Immun,2016
4. What is the private sector: understanding private provision in the health systems of low-income and middle-income countries;Mackintosh;Lancet (online June 26, 2016),2016
5. National immunization data, Western Pacific Region. WHO UNICEF Joint Reporting Form. 2015. http://www.wpro.who.int/immunization/documents/national_immunization_data.