World Health Organization United Nations Environment Programme. (1991). Surface water drainage for low-income communities. World Health Organization in collaboration with the United Nations Environment Programme.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization United Nations Environment Programme. Surface Water Drainage for Low-income Communities. Geneva: World Health Organization in collaboration with the United Nations Environment Programme, 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)World Health Organization United Nations Environment Programme. Surface Water Drainage for Low-income Communities. World Health Organization in collaboration with the United Nations Environment Programme, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.