(1994). Operation and Maintenance of Urban Water Supply and Sanitation Systems A guide for Managers. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Operation and Maintenance of Urban Water Supply and Sanitation Systems A Guide for Managers. Ginebra: World Health Organization, 1994.
MLA-Zitierstil (9. Ausg.)Operation and Maintenance of Urban Water Supply and Sanitation Systems A Guide for Managers. World Health Organization, 1994.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.