United Nations. (1972). Guidelines for project evaluation. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Guidelines for Project Evaluation. New York: United Nations, 1972.
Citatione MLA (9a ed.)United Nations. Guidelines for Project Evaluation. United Nations, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.