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REFERENCES CITED

  • Holzer, Jerzy 1968 The seasonality of vital events in selected cities of Ghana: an analysis of registration data relating to the period 1956–1960. In The population of tropical Africa. John C.Caldwell, and ChukukuOkonjo, eds. New York: Columbia University Press.
  • Udry, J. Richard, and Naomi M. Morris n.d. Seasonality of coitus and seasonality of birth. U. S. Children's Bureau (P.H. 300) and Public Health Service (FR-5450-05) Study. Durham, N.C.: University of North Carolina. Mimeographed.
  • U. S. Department of Health, Education and Welfare.
  • U. S. Department of Health, Education and Welfare 1966 Seasonal variation of births, United States, 1933–1963. National Center for Health Statistics 21(9):110.
  • Zetterberg, Hans L. 1970 The contraceptive society. Totawa, N. J.: Bedminster Press.