Heath, R. L., & O'Hair, H. D. (2009). Handbook of risk and crisis communication. Routledge.
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Dyfyniad Arddull Chicago
Heath, Robert L., and H. Dan O'Hair. Handbook of Risk and Crisis Communication. New York: Routledge, 2009.
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Dyfyniad MLA
Heath, Robert L., and H. Dan O'Hair. Handbook of Risk and Crisis Communication. Routledge, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.