1. African Development Bank (AfDB) (2011). The Middle of the Pyramid: Dynamics of the Middle Class in Africa. http://www.afdb.org/fileadmin/uploads/afdb/Documents/Publications/The%20Middle%20of%20the%20Pyramid_The%20Middle%20of%20the%20Pyramid.pdf
2. Banerjee, A. V. & Duflo, E. (2007a). The Economic Lives of the Poor. Journal of Economic Perspectives. DOI: https://doi.org/10.1257/jep.21.1.141 .
3. Banerjee, A. V. & Duflo, E. (2007b). What is middle class about the middle classes around the world? https://economics.mit.edu/files/2081
4. Birdsall, N. (2010). The (Indispensable) Middle Class in Developing Countries; or, the Rich and the Rest, Not the Poor and the Rest, in Ravi, K., Spence, M. (eds.), Equity in a Globalizing World Washington: World Bank. http://siteresources.worldbank.org/EXTPREMNET/Resources/489960-1338997241035/Growth_Commission_Equity_Growth_Globalizing_World.pdf
5. Boserup, E. (1970). Woman’s role in economic development. London: George Allen & Unwin.