APA (7th ed.) Citation

World Health organization. (2006). Guidelines for drinking - water quality: Recommendations. World Health Organization.

Chicago Style (17th ed.) Citation

World Health organization. Guidelines for Drinking - Water Quality: Recommendations. Geneva: World Health Organization, 2006.

MLA (8th ed.) Citation

World Health organization. Guidelines for Drinking - Water Quality: Recommendations. World Health Organization, 2006.