United Nations. Ad Hoc Expert Group on Demographic Projections. (1984). Population projections, methodology of the United Nations: Papers of the United Nations Ad Hoc Expert Group on Demographic Projections, United Nations Headquarters, 16-19 November 1981. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Ad Hoc Expert Group on Demographic Projections. Population Projections, Methodology of the United Nations: Papers of the United Nations Ad Hoc Expert Group on Demographic Projections, United Nations Headquarters, 16-19 November 1981. New York: United Nations, 1984.
Citatione MLA (9a ed.)United Nations. Ad Hoc Expert Group on Demographic Projections. Population Projections, Methodology of the United Nations: Papers of the United Nations Ad Hoc Expert Group on Demographic Projections, United Nations Headquarters, 16-19 November 1981. United Nations, 1984.