World Health Organization & ebrary, Inc. (2009). Guide to hygiene and sanitation in aviation (3rd ed.). World Health Organization.
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Dyfyniad Arddull Chicago
World Health Organization and Inc ebrary. Guide to Hygiene and Sanitation in Aviation. 3rd ed. Geneva: World Health Organization, 2009.
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Dyfyniad MLA
World Health Organization and Inc ebrary. Guide to Hygiene and Sanitation in Aviation. 3rd ed. World Health Organization, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.