Não informado. (1999). Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Environment and Urbanization. London: International Institute for Environment and Development, Human Settlements Programme, 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Environment and Urbanization. International Institute for Environment and Development, Human Settlements Programme, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.