United Nations. Economic and Social Commission for Asia and the Pacific. (1999). Guidelines on integrated planning for sustainable tourism development. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations. Economic and Social Commission for Asia and the Pacific. Guidelines on Integrated Planning for Sustainable Tourism Development. New York: United Nations, 1999.
Citatione MLA (9a ed.)United Nations. Economic and Social Commission for Asia and the Pacific. Guidelines on Integrated Planning for Sustainable Tourism Development. United Nations, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.