United Nations Centre for Human Settlements, & United Nations Environment Programme. (1997). Environmental planning and management (EPM) source book. Nairobi, Kenya: United Nations Centre for Human Settlements : United Nations Environment Programme.
Παραπομπή Chicago StyleUnited Nations Centre for Human Settlements, και United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. Nairobi, Kenya: United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.
Παραπομπή MLAUnited Nations Centre for Human Settlements, και United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. Nairobi, Kenya: United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.