1. World Migration Report 2015. Migrants and Cities: New Partnerships to Manage Mobility,2015
2. World Urbanization Prospects: The 2014 Revision, Highlights (ST/ESA/SER.A/352)https://esa.un.org/unpd/wup/Publications/Files/WUP2014-Highlights.pdf
3. City Population: Population Statistics for Countries, Administrative Areas, Cities and Agglomerationshttp://www.citypopulation.de/world/Agglomerations.html
4. The State of the Poor: Where Are the Poor, Where Is Extreme Poverty Harder to End, and What Is the Current Profile of the World’s Poor?,2013
5. The 2010 Universe of Cities: A New Perspective on Global Urbanization;Galarza;Sustainability,2016