United Nations. Department of International Economic and Social Affairs, International Labour Organisation, & Food and Agriculture Organization of the United Nations. (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.
Citazione stile Chigago Style (17a edizione)United Nations. Department of International Economic and Social Affairs, International Labour Organisation, e Food and Agriculture Organization of the United Nations. 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.
Citatione MLA (9a ed.)United Nations. Department of International Economic and Social Affairs, et al. 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.