1. Economic origins of dictatorship and democracy;Acemoglu,2006
2. The rise of Asia’s middle class;Adb,2010
3. Society, politics, and economic development: A quantitative approach;Adelman,1967
4. AfDB (2011). The middle of the pyramid: Dynamics of the middle class in Africa. Report by the Chief Economist Complex, African Development Bank.
5. What is middle class about the middle classes around the world?;Banerjee;Journal of Economic Perspectives,2008