United Nations. (1990). Directory of technical co-operation in statistics. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Directory of Technical Co-operation in Statistics. New York: United Nations, 1990.
Citatione MLA (8a ed.)United Nations. Directory of Technical Co-operation in Statistics. United Nations, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.