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.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.