Mehr, A. (2008) Comprehensive Textbook of Clinical Immunizationin Preventive Medicine. Khosravi Pub., Tehran, 23-30.
 UNICEF. Immunization—Expanding Immunization Coverage. Unit for Children.
 El-Tayeb Ahmed, E.S. (2006) Highlights on the Expanded Programon Immunization (EPI) in Sudan. Sudanese Journal of Public Health, 1, 152-158.
 Borras, E., Dominguez, A., Batalla, J., Torner, N., Cardenosa, N., Nebot, M., Plasencia, A. and Salleras, L. (2007) Vaccination Coverage in Indigenous and Immigrant Children under 3 Years of Age in Catalonia (Spain). Vaccine, 25, 3240-3243.
 Ehreth, J. (2003) The Global Value of Vaccination. Vaccine, 21, 596-600.
 Barker, L.E. and Luman, E.T. (2001) Changes in Vaccination Coverage Estimates among Children Aged 19-35 Months in the United States, 1996-1999. American Journal of Preventive Medicine, 20, 45.
 (2006) Immunization Snap Shots. News, Documents and Tools on Routine Immunization and Sustainable Financing February 2006/Issue 2. Coverage Confusion! Trying to Make Sense of It.
 Bos, E. and Batson, A. (2000) Using Immunization Coverage Rates for Monitoring Health Sector Performance. Measurement and Interpretation Issues. HNP Discussion Paper, August 2000.
 (2008) World Health Organization. Department of Immunization, Vaccine and Biologicals. Vaccine-Preventable Diseases: Monitoring System, 2008 Global Summary, Geneva 27—Switzerland.
 Zahraei, S.M., Marandi, A., Sadrizadeh, B., Gouya, M.M., Rezaei, P., Vazirian, P., et al. (2010) Role of National Immunization Technical Advisory Group on Improvement of Immunization Programmes in the Islamic Republic of Iran. Vaccine, 28, A35-A38.
 (2005) World Health Organization. Immunization against Diseases of Public Health Importance, the Benefits of Immunization. Fact Sheet No 288. March 2005.
 Chokephaibulkit, K., Phongsamart, W., Vanprapar, N., Chotpitayasunondh, T. and Chearskul, S. (2004) Catch-Up Vaccination against Haemophilus Influenzae Type b in Human Immunodeficiency Virus-Infected Thai Children Older than 2 Years Old. Vaccine, 22, 2018-2022.
 Burton, A., Monach, R., Lautenbach, B., Gacic-Dobo, M., Neill, M., Karimov, R., Wolfson, L., Jones, G. and Birmingham, M. (2009) WHO and UNICEF Estimates of National Infant Immunization Coverage: Methods and Processes. Bulletin of the World Health Organization, 87, 535-541.
 WHO (2005) Immunization Service Delivery and Accelerated Disease Control. New Vaccines and Technologies.
 WHO (2009) World Health Statistics. Selected Infectious Diseases. 59-69.
 Dayan, G.H., Orellana, L.C., Forlenza, R., Eliss, A., Chaui, J., Kaplan, S. and Strebel, P. (2004) Vaccination Coverage among Children Aged 13 to 59 Months in Buenos Aires, Argentina. Pan American Journal of Public Health, 16, 158-167.
 (2013) World Health Organization, WHO-UNICEF Estimates of DTP3 Coverage. December 26, 2013.
 WHO—Immunization, Vaccines and Biologicals.
 (2006) Challenges in Global Immunization and the Global Immunization Vision and Strategy 2006-2015. Weekly Epidemiological Record, 81, 189-196.