Posner, R. A. (2004). Catastrophe: Risk and response. Oxford University Pres.
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Dyfyniad Arddull Chicago
Posner, Richard A. Catastrophe: Risk and Response. Oxford ; New York: Oxford University Pres, 2004.
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Dyfyniad MLA
Posner, Richard A. Catastrophe: Risk and Response. Oxford University Pres, 2004.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.