1. World Health Organisation. Maternal, newborn, child and adolescent health
http://www.who.int/maternal_child_adolescent/topics/adolescence/dev/en/
[Accessed 26 August 2016]
2. UNICEF. Demographic trends for adolescents
http://www.unicef.org/sowc2011/pdfs/Demographic-Trends.pdf
[Accessed 26 August 2016]