1. World Health Organization www.who.int/child_adolescent_health/documents/9241593784/en/
2. Statistics South Africa www.statssa.gov.za/publications/P0305/P03052011.pdf
3. Adolescent pregnancy and associated factors in South African youth;Mchunu;Afr Health Sci,2012
4. The 2011 National Antenatal Sentinel HIV & Syphilis Prevalence Survey in South Africa http://www.hst.org.za/publications/2011-national-antenatal-sentinel-hiv-syphilis-prevalence-survey-south-africa
5. Obstetric and perinatal outcomes of teenage pregnancies in Thailand;Thaithae;J Pediatr Adolesc Gynecol,2011