Dyfyniad APA

(1994). Operation and maintenance of water supply and sanitaion systems: Case studies. Genava: World Health Organization (WHO).

Dyfyniad Arddull Chicago

Operation and Maintenance of Water Supply and Sanitaion Systems: Case Studies. Genava: World Health Organization (WHO), 1994.

Dyfyniad MLA

Operation and Maintenance of Water Supply and Sanitaion Systems: Case Studies. Genava: World Health Organization (WHO), 1994.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.