Harbison, R. W., & Hanushek, E. A. (1992). Educational performance of the poor: Lessons from rural northeast Brazil. Published for the World Bank, Oxford University Press.

Harbison, Ralph W., and Eric A. Hanushek. Educational Performance of the Poor: Lessons from Rural Northeast Brazil. Oxford ; New York: Published for the World Bank, Oxford University Press, 1992.

Harbison, Ralph W., and Eric A. Hanushek. Educational Performance of the Poor: Lessons from Rural Northeast Brazil. Published for the World Bank, Oxford University Press, 1992.