Berry, Brian J. L., and Heja Kim. “Demographic Efficiency: Concept and Estimation.” Population and Environment, vol. 23, no. 3, 2002, pp. 267–284., www.jstor.org/stable/27503791. Accessed 8 Aug. 2020.
Berry, B., & Kim, H. (2002). Demographic Efficiency: Concept and Estimation. Population and Environment, 23(3), 267-284. Retrieved August 8, 2020, from www.jstor.org/stable/27503791
Berry, Brian J. L., and Heja Kim. "Demographic Efficiency: Concept and Estimation." Population and Environment 23, no. 3 (2002): 267-84. Accessed August 8, 2020. www.jstor.org/stable/27503791.
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