United Nations Environment Programme & United Nations Centre for Human Settlements. (1987). Environmental guidelines for settlements planning and management. United Nations Environment Programme. United Nations Centre for Human Settlements (Habitat).
Citazione stile Chigago Style (17a edizione)United Nations Environment Programme e United Nations Centre for Human Settlements. Environmental Guidelines for Settlements Planning and Management. Nairobi, Kenya: United Nations Environment Programme. United Nations Centre for Human Settlements (Habitat), 1987.
Citatione MLA (9a ed.)United Nations Environment Programme e United Nations Centre for Human Settlements. Environmental Guidelines for Settlements Planning and Management. United Nations Environment Programme. United Nations Centre for Human Settlements (Habitat), 1987.