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http://unstats.un.org/unsd/demographic/sources/census/censusdates.htm
[2] United Nations, Department of Economic and Social Affairs, Population Division (2013) World Population Prospects: The 2012 Revision. UNDESA, New York.
[3] Brown, D.W., Feeney, G. and Burton, A.H. (2012) Raising Awareness among Immunization Programme Managers to the Potential Bias Resulting from the Application of Fixed Factors to Obtain Target Population Size Estimates. The Open Public Health Journal, 5, 15-18.
http://www.benthamscience.com/open/tophj/articles/V005/15TOPHJ.pdf
[4] (2012) United Nations Children’s Fund (UNICEF) Generation 2025 and Beyond. The Critical Importance of Understanding Demographic Trends for Children of the 21st Century. UNICEF, New York.
http://www.childinfo.org/files/Generation_2025_and_beyond_Nov2012.pdf