APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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