APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.