World Health Organization. (2000). Tools for assessing the O&M status of water supply and sanitation in developing countries. World Health Organization.
Chicago-Zitierstil (17. Ausg.)World Health Organization. Tools for Assessing the O&M Status of Water Supply and Sanitation in Developing Countries. Geneva: World Health Organization, 2000.
MLA-Zitierstil (8. Ausg.)World Health Organization. Tools for Assessing the O&M Status of Water Supply and Sanitation in Developing Countries. World Health Organization, 2000.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.