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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United Nations Centre for Human Settlements و United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. Nairobi, Kenya: United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United Nations Centre for Human Settlements و United Nations Environment Programme. Environmental Planning and Management (EPM) Source Book. United Nations Centre for Human Settlements : United Nations Environment Programme, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.