Keyfitz, N., & Flieger, W. (1971). Population: Facts and methods of demography. W. H. Freeman.
Chicago Style (17. basım) AtıfKeyfitz, Nathan, ve Wilhelm Flieger. Population: Facts and Methods of Demography. San Francisco: W. H. Freeman, 1971.
MLA (8th ed.) AtıfKeyfitz, Nathan, ve Wilhelm Flieger. Population: Facts and Methods of Demography. W. H. Freeman, 1971.
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