1. World Health Organization. World Health Statistics 2011. Available at: http://www.who.int/entity/gho/publications/world_health_statistics/EN_WHS2011_Full.pdf . Accessed on 27 December 2011.
2. No authors listed. Multi Year Strategic Plan 2005–2010. Universal Immunization Programme. New Delhi: Department of Family Welfare, Ministry of Health and Family Welfare Government of India; 2005.
3. Singh P, Yadav RJ. Immunization status of children of India. Indian Pediatr. 2000;37:1194–1199
4. International Institute for Population Sciences (IIPS). National Family Health Survey (MCH and Family Planning), 1992–93: India. Mumbai: IIPS; 1995.
5. International Institute for Population Sciences (IIPS) and ORC Macro. National Family Health Survey (NFHS-2), 1998–99: India. Mumbai: IIPS; 2000.