1. World health organization (2013) Progress in reproductive health research. Available: http://www.who.int/reproductivehealth/hrp/progress/58/news. Accessed 2014 February 12.
2. Central Statistical Agency (2011) Ethiopia Demographic and Health survey. Central statistical agency, Addis Ababa.
3. National adolescent health information center, University of California (2004) Improving the health of adolescents & young adults. Available: http://nahic.ucsf.edu/wpcontent/uploads/2011/11/Complete2010Guide.pdf. Accessed 2014 February 18.
4. United Nations, educational, scientific and cultural organization (UNESCO) (2014) Puberty education and menstrual hygiene management. Available: http://unesdoc.unesco.org/images/0022/002267/226792e.pdf-puberty. Accessed 2014 April 25.
5. World health organization (2012) Introduction to adolescence & adolescent health. Training course in sexual and reproductive health research. Available: http://www.gfmer.ch/SRH-Course-2012/adolescent-health/pdf/Introduction-adolescence-adolescent-health-WHO-2012.pdf. Accessed 2014 February 12.