1. Atkinson, A. B., & Morelli, S. (2011). “Economic crises and inequality”. HUman Development Research Paper, UNDP-HDRO Occasional Papers No. 2011/6, November. http://hdr.undp.org/sites/default/files/hdrp_2011_06.pdf . Accessed 5 May 2018.
2. CSO (2011), Time – Series Data On Annual Survey Of Industries (1998–99 To 2007–08), Ministry Of Statistics And Programme Implementation Central Statistics Office (Industrial Statistics Wing), Government Of India, Kolkata.
3. Doeringer, P. and M.J. Piore (1971), Internal labor markets and manpower adjustment, DC Heath and Company, New York.
4. Hart, K. (1973), “Informal income opportunities and urban employment in Ghana”, The Journal of Modern African Studies, Vol. 11, No. 1, pp. 61–89.
5. Hart, K. (2005), “Formal bureaucracy and the emergent forms of the informal economy”, Research Paper No. 2005/11, UNU-WIDER, United Nations University.