Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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