Cita APA (7th ed.)

World Health Organization. (2011). Guidelines for drinking-water quality (4th.). World Health Organization.

Cita Chicago (17th ed.)

World Health Organization. Guidelines for Drinking-water Quality. 4th. Geneva, Switzerland: World Health Organization, 2011.

Cita MLA (8th ed.)

World Health Organization. Guidelines for Drinking-water Quality. 4th. World Health Organization, 2011.