1. All Party Parliamentary Group on Population, Development and Reproductive Health. (2007). Return of the population growth factor: Its impact on the millennium development goals. Report of hearings by the All Party Parliamentary Group on Population, Development and Reproductive Health. London: HMSO.
2. Campbell, M., Cleland, J., Ezeh, A., & Prata, N. (2007). Return of the population growth factor. Science, 315(5818), 1501–1502.
3. Cates, W. (2009). The future of international leadership in family planning and reproductive health. Presentation at the Family Health International, July 15, 2009, Nairobi, Kenya.
4. Cleland, J., Bernstein, S., Ezeh, A., Faundes, A., Glasier, A., & Innis, J. (2006). Family planning: The unfinished agenda. The Lancet, 368, 1810–1827.
5. Birdsall, N., Kelly, A., Livingston, D., & Sinding, S. (2001). Population matters: Demographic change, economic growth, and poverty in the developing world. Oxford: Oxford University Press.