World Health Organization United Nations Environment Programme. (2006). Who guidelines for the safe use of wastewater excreta and greywater: Waste water and excreta use in agriculture. World Health Organization.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)World Health Organization United Nations Environment Programme. Who Guidelines for the Safe Use of Wastewater Excreta and Greywater: Waste Water and Excreta Use in Agriculture. Geneva: World Health Organization, 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)World Health Organization United Nations Environment Programme. Who Guidelines for the Safe Use of Wastewater Excreta and Greywater: Waste Water and Excreta Use in Agriculture. World Health Organization, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.