(2022). Global Drug Survey 2022. Global Drug Survey.
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Dyfyniad Arddull Chicago
Global Drug Survey 2022. Londres: Global Drug Survey, 2022.
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Dyfyniad MLA
Global Drug Survey 2022. Global Drug Survey, 2022.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.