World population : an analysis of vital data /

ανά Keyfitz, Nathan
Έκδοση 1968

Comparative demographic computations : based on official (unadjusted) data for 69 selected countries and regions /

ανά Keyfitz, Nathan
Έκδοση 1964

Applied mathematical demography /

ανά Keyfitz, Nathan, 1913-
Έκδοση 1977