World Health Organization. (2019). World report on vision. World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization. World Report on Vision. Ginebra: World Health Organization, 2019.
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Dyfyniad MLA
World Health Organization. World Report on Vision. World Health Organization, 2019.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.