United Nations Centre for Human Settlements & United Nations Environment Programme. (1997). Environmental planning and management (EPM) source book. United Nations Centre for Human Settlements : United Nations Environment Programme.
Chicago-referens (17:e uppl.)United Nations Centre for Human Settlements och United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. Nairobi, Kenya: United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.
MLA-referens (9:e uppl.)United Nations Centre for Human Settlements och United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.