Berry, Brian J. L. “Fertility Cycles: A Note on Onset and Periodicity.” Population and Environment, vol. 21, no. 2, 1999, pp. 149–154., www.jstor.org/stable/27503695. Accessed 8 Aug. 2020.
Berry, B. (1999). Fertility Cycles: A Note on Onset and Periodicity. Population and Environment, 21(2), 149-154. Retrieved August 8, 2020, from www.jstor.org/stable/27503695
Berry, Brian J. L. "Fertility Cycles: A Note on Onset and Periodicity." Population and Environment 21, no. 2 (1999): 149-54. Accessed August 8, 2020. www.jstor.org/stable/27503695.
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