Não informado. (1999). Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme.
Chicago-referens (17:e uppl.)Não informado. Environment and Urbanization. London: International Institute for Environment and Development, Human Settlements Programme, 1999.
MLA-referens (8:e uppl.)Não informado. Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.