Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

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