Lutz, W., Vaupel, J. W., & Ahlburg, D. A. (1999). Frontiers of population forecasting. Population Council.
Lua i Stíl Chicago (17ú heag.)Lutz, Wolfgang, James W. Vaupel, agus Dennis A. Ahlburg. Frontiers of Population Forecasting. New York: Population Council, 1999.
Lua MLA (8ú heag.)Lutz, Wolfgang, et al. Frontiers of Population Forecasting. Population Council, 1999.
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