1. International Organisation for Migration 2009 http://www.iom.int/jahia/Jahia/about - migration/facts - and - figures/global - estimates - and - trends
2. World Health Organization 2010 http://www.who.int/hac/events/ consultation_report_health_migrants_colour_web.pdf
3. UNHCR 2009 http:// www.unhcr.org/cgibin/texis/vtx/search?page=search&docid=4c11f 0be9 & query=2010%20global%20trends
4. US State Department 2006 http://www.state.gov/g/tip/rls/tiprpt/2006