APA (7th ed.) Citation

Keyfitz, N., & Flieger, W. (1990). World population growth and aging: Demographic trends in the late twentieth century. University of Chicago Press.

Chicago Style (17th ed.) Citation

Keyfitz, Nathan, and Wilhelm Flieger. World Population Growth and Aging: Demographic Trends in the Late Twentieth Century. Chicago: University of Chicago Press, 1990.

MLA (9th ed.) Citation

Keyfitz, Nathan, and Wilhelm Flieger. World Population Growth and Aging: Demographic Trends in the Late Twentieth Century. University of Chicago Press, 1990.