Naciones Unidas Departamento de Asuntos Económicos y Sociales. (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 /. New York: United Nations.
Chicago Style CitationNaciones Unidas Departamento de Asuntos Económicos y Sociales. World Demographic Estimates and Projections, 1950-2025: Total Population, School-age Population, Economically Active Population, Agricultural and Non-agricultural Population, Urban and Rural Population /. New York: United Nations, 1988.
MLA CitationNaciones Unidas Departamento de Asuntos Económicos y Sociales. World Demographic Estimates and Projections, 1950-2025: Total Population, School-age Population, Economically Active Population, Agricultural and Non-agricultural Population, Urban and Rural Population /. New York: United Nations, 1988.