1. Edmonds E (2008) Defining child labour: A review of the definitions of child labour in policy research. Geneva
2. International Labour Organisation What is child labour (2015). http://www.ilo.org/ipec/facts/lang–en/index.htm . Accessed 21 May 2015
3. United Nations Child Labour: Vital Statistics (2015). http://www.un.org/en/globalissues/briefingpapers/childlabour/vitalstats.shtml . Accessed 21 May 2015
4. University of Iowa Health Issues (2015). In: Child Labour Public Educ. Proj. https://www.continuetolearn.uiowa.edu/laborctr/child_labor/about/health_issues.html . Accessed 21 May 2015
5. Fekadu D, Hagglof B, Alem A et al (2010) Review of child labor with emphasis on mental health. Curr Psychiatry Rev 6:176–183