World Health Organization. (2011). Guidelines for drinking-water quality (4th.). World Health Organization.
Citação do estilo Chicago (17ª ed.)World Health Organization. Guidelines for Drinking-water Quality. 4th. Geneva, Switzerland: World Health Organization, 2011.
Citação MLA (8ª ed.)World Health Organization. Guidelines for Drinking-water Quality. 4th. World Health Organization, 2011.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.