1. World Health Organization. Maternal, newborn, child and adolescent health [cited 2019 Feb]. Available at: https://www.who.int/maternal_child_adolescent/topics/adolescence/development/en/
2. Dick B, Ferguson BJ. Health for the World’s Adolescents: A Second Chance in the Second Decade. J Adolesc Health. 2015;56:3–6.
3. United Nations. World Population Monitoring Adolescents and Youth: A Concise Report Adolescents and Youth. New York: United Nations; 2012.
4. World Health Organization Regional Office for Europe and BZgA. Standards for Sexuality Education in Europe: a framework for policy makers, educational and health authorities and specialists. Cologne: BZgA; 2010. Available at: https://www.oif.ac.at/fileadmin/OEIF/andere.../WHO_BZgA_Standards.pdf
5. World Health Organization. Developing sexual health programs. A frame work for action. Geneva: WHO; 2010. Available at: whqlibdoc.who.int/hq/2010/WHO_RHR_HRP_10.22_eng.pdf