Cita APA (7th ed.)

Keyfitz, N. (1968). World population: An analysis of vital data. University of Chicago Pr..

Cita Chicago (17th ed.)

Keyfitz, Nathan. World Population: An Analysis of Vital Data. Chicago: University of Chicago Pr., 1968.

Cita MLA (9th ed.)

Keyfitz, Nathan. World Population: An Analysis of Vital Data. University of Chicago Pr., 1968.