Dyfyniad APA

World Health Organization. (1991). Surface water drainage for low income communities. B R.

Dyfyniad Arddull Chicago

World Health Organization. Surface Water Drainage for Low Income Communities. Delhi: B R, 1991.

Dyfyniad MLA

World Health Organization. Surface Water Drainage for Low Income Communities. B R, 1991.

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