TVE international. (1997). Science for Survival. Television Trust for Environment.
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Dyfyniad Arddull Chicago
TVE international. Science for Survival. London, UK: Television Trust for Environment, 1997.
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Dyfyniad MLA
TVE international. Science for Survival. Television Trust for Environment, 1997.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.