1. Children in American street trades;Adams;Annals of the American Academy of Political and Social Science,1905
2. Bachman , S. L. 2000 Business Economics www.nabe.com/publib/be/000330.pdf
3. van de Glind , H. 2010 Migration and Child Labour: Exploring Child Migrant Vulnerabilities and Those of Children Left-Behind www.ilo.org/ipecinfo/product/viewProduct.do?productId=14313