Birdsall, N., Levine, R., & Ibrahim, A. (2005). Towards universal primary education: Investments, incentives, and institutions. Sterling, Va. : Earthscan.

Birdsall, Nancy, Ruth Levine, and Amina Ibrahim. Towards Universal Primary Education: Investments, Incentives, and Institutions. London: Sterling, Va. : Earthscan, 2005.

Birdsall, Nancy, et al. Towards Universal Primary Education: Investments, Incentives, and Institutions. Sterling, Va. : Earthscan, 2005.