Não informado. (1999). Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme.
Citação do estilo Chicago (17ª ed.)Não informado. Environment and Urbanization. London: International Institute for Environment and Development, Human Settlements Programme, 1999.
Citação MLA (8ª ed.)Não informado. Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme, 1999.
警告：這些引文格式不一定是100％准確.