United Nations. Department of International Economic and Social Affairs. (1989). Global estimates and projections of population by sex and age: The 1988 revision. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Department of International Economic and Social Affairs. Global Estimates and Projections of Population by Sex and Age: The 1988 Revision. New York: United Nations, 1989.
Citatione MLA (9a ed.)United Nations. Department of International Economic and Social Affairs. Global Estimates and Projections of Population by Sex and Age: The 1988 Revision. United Nations, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.