1. Barclay, G. W. (1966). Techniques of population analysis. New York: Wiley.
2. Bongaarts, J., & Bulatao, R. A. (Eds.). (2000). Beyond six billion: Forecasting the world’s population. Washington, DC: National Academy Press.
3. Caldwell, J. C. (2003). The contemporary population challenge. Population Bulletin of the United Nations, Completing the Fertility Transition, Special Issues, Nos 48/49, 81–88.
4. Castles, F. G. (2004). The future of the welfare state: Crisis myths and crisis realities. Oxford: Oxford University Press.
5. Castles, S., & Miller, M. J. (2003). The age of migration: International population movements in the modern world. New York: Guildford Press.