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3. Ethiopian Central Statistics Agency. Preliminary Ethiopian Demographic and Health Survey 2011. Addis Ababa: Ethiopian Central Statistics Agency; 2011.
4. UNFPA. Summary and Statistical Report of the 2007 Population and Housing Census Results. Addis Ababa: UNFPA; 2008. http://ecastats.uneca.org/aicmd/Portals/0/Cen2007_firstdraft.pdf
5. De Souza R-M. Focus on population, environment and security. Washington: Woodrow Wilson International center For Scholars & USAID; 2009. p. 1–9. https://www.wilsoncenter.org/sites/default/files/Focus_19_DeSouza.pdf