APA aipamena

Keyfitz, N., & Flieger, W. (1968). World population: An analysis of vital data. University of Chicago Press.

Chicago Style aipamena

Keyfitz, Nathan, and Wilhelm Flieger. World Population: An Analysis of Vital Data. Chicago: University of Chicago Press, 1968.

MLA aipamena

Keyfitz, Nathan, and Wilhelm Flieger. World Population: An Analysis of Vital Data. University of Chicago Press, 1968.