1. Bag, D. (2021). Transition from informal firms to formal. Economic and Political Weekly, 56(50)
2. Barnes, T. (2007). Informal labour in urban India: Three cities, three journeys. Routledge.
3. Baruah, P. B. (2019) Unorganised enterprises and financial inclusion: A study in Assam. Working paper no. CDS/04/2019. Centre for Development Studies, Department of Economics Rajiv Gandhi University Rono Hills.
4. Chen, M. (2007). Rethinking the informal economy: Linkages with the formal economy and the formal regulatory environment. DESA working paper no. 46ST/ESA/2007/DWP/46, July.
5. Eichengreen, B., & Gupta, P. (2013). The two waves of service-sector growth. Oxford Economic Papers, 65(2013), 96–123.