1. Ahmed S, Ahmed W, Pasha F, Khan S, Rehman M (2012) Pakistan economy DSGE model with informality. State Bank of Pakistan (SBP) Working paper series, no. 47
2. Aryeetey E (1996) The potential for expanded economic activity in the informal sector. Institute of Economic Affairs, Accra
3. Blair JP, Endres CR (1994) Hidden economic development assets. Econ Dev Q 8(3):286–291
4. Bryceson D (2006) African urban economies: searching for sources of sustainability. In: Bryceson D, Potts D (eds) African urban economies: viability, vitality or vitiation of major cities in east and southern Africa? Palgrave Macmillan, Houndmills
5. Cardenas D (2014) The informal economy and the constraints that it imposes on pension contributions in Latin America. Rev Bus Econ 2(4):18–50