Cita APA

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

Citación estilo Chicago

Keyfitz, Nathan, y John A. Beekman. Demography Through Problems. New York: Springer-Verlag, 1984.

Cita MLA

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