1. Global Alliance for Vaccines and Immunization. Fact Sheet No. 169. World Health Organization Media Centre; 2011.
2. The economics of vaccination from a global perspective: Present and future 2-3 december, 2004, vaccines: All things considered, San Francisco, CA, USA;Ehreth;Expert Rev Vaccines,2005
3. Return on investment from childhood immunization in low and middle-income countries, 2011-20;Ozawa;Health Aff (Millwood),2016
4. Available from: https://www.who.int/immunization/programmes_systems/supply_chain/benefits_of_immunization/en. [Last accessed on 2019 Jan 15].
5. Khere A, Gupta A, Gogia H, Rao S. India's National Immunization Programme. New Delhi: Seminar Publication; 2012. Available from: http://www.india-seminar.com/2012/631/631_ajay_khera_et_at html. [Last cited on 2018 Aug 05].