1. UN-Habitat. State of the World’s Cities 2006/2007. The Millennium Development Goals and Urban Sustainability: 30 Years of Shaping the Habitat Agenda. Nairobi: United Nations Human Settlements Programme (UN-HABITAT); 2006. https://sustainabledevelopment.un.org/content/documents/11292101_alt.pdf [Accessed: 2015-07-05]
2. Urbanization in 2013. Demographic partitions [Internet]. 2014. Available from http://demographicpartitions.org/urbanization-2013/ [Accessed: 2018-03-10]
3. National Library of Medicine. Urbanization [Internet]. 2018. Available from: https://meshb.nlm.nih.gov/record/ui?name=Urbanization [Accessed: 2018-03-10]
4. World Bank. World Bank National Accounts Data, and OECD National Accounts Data Files. 2018. Available from: https://data.worldbank.org/country/Nigeria [Accessed: 2018-02-2]
5. Dover, Delaware, USA. Worldometers.info [Internet]. 2018. Available from: http://www.worldometers.info/world-population/nigeria-population/ [Accessed: 2018-03-16]