Departement of international economic and social affairs. (1989). World population prospects 1988: Population studies. United nations.
Чикаго маягийн жагсаалтDepartement of international economic and social affairs. World Population Prospects 1988: Population Studies. New York: United nations, 1989.
MLA ишлэлDepartement of international economic and social affairs. World Population Prospects 1988: Population Studies. United nations, 1989.
Warning: These citations may not always be 100% accurate.