References
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- The World Bank . n.d. . World Development Report 2010: Development and climate change , Washington, DC : The World Bank . Available from: http://siteresources.worldbank.org/INTWDR2010/Resources/5287678-1226014527953/Statistical-Annex.pdf/
- United Nations Development Programme (UNDP) . 2009 . Human development report 2009: Overcoming barriers: Human mobility and development , New York, NY : UNDP .