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References

  • Caldwell, J. C. and Pat, Caldwell. 1977. “The role of marital sexual abstinence in determining fertility: A study of the Yoruba in Nigeria,” Population Studies 31: 193217.
  • Henry, Louis. 1961. “Some data on natural fertility,” Eugenics Quarterly 8: 8191.
  • Knodel, John. 1983. “Natural fertility: Age patterns, levels, and trends,” in Rodolfo, A. Bulatao, Ronald D., Lee (eds.), Determinants of Fertility in Developing Countries, Volume 1. New York : Academic Press, pp 61102.
  • Page, Hilary J., Ron, Lesthaeghe (eds.). 1981. Child Spacing in Tropical Africa: Traditions and Change. London : Academic Press.