World Health organization. (2006). Guidelines for drinking - water quality: Recommendations. World Health Organization.
Chicago-referens (17:e uppl.)World Health organization. Guidelines for Drinking - Water Quality: Recommendations. Geneva: World Health Organization, 2006.
MLA-referens (8:e uppl.)World Health organization. Guidelines for Drinking - Water Quality: Recommendations. World Health Organization, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.