APA引文

Keyfitz, N., & Flieger, W. (1971). Population: Facts and methods of demography. W. H. Freeman.

Chicago Style (17th ed.) Citation

Keyfitz, Nathan, and Wilhelm Flieger. Population: Facts and Methods of Demography. San Francisco: W. H. Freeman, 1971.

MLA引文

Keyfitz, Nathan, and Wilhelm Flieger. Population: Facts and Methods of Demography. W. H. Freeman, 1971.