Dyfyniad APA

W H O. (1991). Surface water drainage for low income communities. World Health Organisation.

Dyfyniad Arddull Chicago

W H O. Surface Water Drainage for Low Income Communities. Geneva: World Health Organisation, 1991.

Dyfyniad MLA

W H O. Surface Water Drainage for Low Income Communities. World Health Organisation, 1991.

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