ebrary, Inc, & Levy, B. S. (2010). Occupational and environmental health: Recognizing and preventing disease and injury (6th ed.). Oxford University Press.
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Dyfyniad Arddull Chicago
ebrary, Inc, and Barry S. Levy. Occupational and Environmental Health: Recognizing and Preventing Disease and Injury. 6th ed. Oxford ; New York: Oxford University Press, 2010.
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Dyfyniad MLA
ebrary, Inc, and Barry S. Levy. Occupational and Environmental Health: Recognizing and Preventing Disease and Injury. 6th ed. Oxford University Press, 2010.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.