1. World Health Organization: Changing History. http://www.who.int/whr/2004/ ] en
2. United Nation Acquired Immunodeficiency Syndrome: World AIDS Facts. Treatment, Prevention and Care. 2011, http://www.unaids.org/globalreport ,
3. UNAIDS: AIDS Epidemic Update Global Report. 2007
4. United Nation Acquired Immunodeficiency Syndrome: HIV Data. Knowledge Centre. 2010, http://www.unaids.org ,
5. Federal Ministry Health of Ethiopia: Single Point HIV Prevalence Estimate. Edited by: HIV/AIDS prevention and control office. 2007, Addis Ababa, Ethiopia: Federal Ministry Health of Ethiopia