(1994). Operation and Maintenance of Urban Water Supply and Sanitation Systems A guide for Managers. World Health Organization.
Citação do estilo Chicago (17ª ed.)Operation and Maintenance of Urban Water Supply and Sanitation Systems A Guide for Managers. Ginebra: World Health Organization, 1994.
Citação MLA (9ª ed.)Operation and Maintenance of Urban Water Supply and Sanitation Systems A Guide for Managers. World Health Organization, 1994.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.