Cita APA (7a ed.)

Keyfitz, N., & Beekman, J. A. (1984). Demography through problems. Springer.

Cita Chicago Style (17a ed.)

Keyfitz, Nathan, y John A. Beekman. Demography Through Problems. New York [etc.]: Springer, 1984.

Cita MLA (9a ed.)

Keyfitz, Nathan, y John A. Beekman. Demography Through Problems. Springer, 1984.