World Health Organization & ebrary, Inc. (2007). Prevention. World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization and Inc ebrary. Prevention. Geneva, Switzerland: World Health Organization, 2007.
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Dyfyniad MLA
World Health Organization and Inc ebrary. Prevention. World Health Organization, 2007.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.