Dyfyniad APA

World Health Organization & ebrary, Inc. (2007). Prevention. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization and Inc ebrary. Prevention. Geneva, Switzerland: World Health Organization, 2007.

Dyfyniad MLA

World Health Organization and Inc ebrary. Prevention. World Health Organization, 2007.

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