Lawrence ,Thomas Gor, Power,Douglas F, Shriver , A., & Vorhaus, J. Your health and safety (6th ed.). Harcourt,Brace and World ,Inc.
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Dyfyniad Arddull Chicago
Lawrence ,Thomas Gor, Power,Douglas F, Alice Shriver , and J.Louis Vorhaus. Your Health and Safety. 6th ed. New York: Harcourt,Brace and World ,Inc.
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Dyfyniad MLA
Lawrence ,Thomas Gor, et al. Your Health and Safety. 6th ed. Harcourt,Brace and World ,Inc.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.