Dyfyniad APA

World Health Organization. (1993). Guidelines for drinking - water quality: Recommendations. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. Guidelines for Drinking - Water Quality: Recommendations. Geneva: World Health Organization, 1993.

Dyfyniad MLA

World Health Organization. Guidelines for Drinking - Water Quality: Recommendations. World Health Organization, 1993.

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