United Nations Department of Economic and Social Affairs. (1988). World demographic estimates and projections, 1950-2025: Total population, school-age population, economically active population, agricultural and non-agricultural population, urban and rural population : a report. United Nations.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations Department of Economic and Social Affairs. World Demographic Estimates and Projections, 1950-2025: Total Population, School-age Population, Economically Active Population, Agricultural and Non-agricultural Population, Urban and Rural Population : A Report. New York: United Nations, 1988.
Παραπομπή σε μορφή MLA (8th εκδ.)United Nations Department of Economic and Social Affairs. World Demographic Estimates and Projections, 1950-2025: Total Population, School-age Population, Economically Active Population, Agricultural and Non-agricultural Population, Urban and Rural Population : A Report. United Nations, 1988.
