1. Adu-Sakordie, K.G., 1994. Re-orientating VOTEC education and training toward self-employment (Ministry of Employment and Social Welfare and UNDP/ILO Umbrella Programme: Sustained Employment Generation, Ghana).
2. The returns to endogenous human capital in Pakistan's rural wage labour market;Alderman;Oxford Bulletin of Economics and Statistics,1996
3. Does compulsory attendance affect schooling and earnings?;Angrist;Quarterly Journal of Economics,1991
4. Education and agricultural productivity: evidence from Uganda;Appleton;Journal of International Development,1996
5. Estimates of the economic return to schooling from a new sample of twins;Ashenfelter;American Economic Review,1994