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.
Chicago-viite (17. p.)World Health Organization ja 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.
MLA-viite (8. p.)World Health Organization ja 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.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.