Cofnodi Dyfyniadau
Dyfyniad APA
Estados Unidos National Foreign Assessment Center. (1978). Polar regions. Central Intelligence Agency.
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Dyfyniad Arddull Chicago
Estados Unidos National Foreign Assessment Center. Polar Regions. Central Intelligence Agency, 1978.
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Dyfyniad MLA
Estados Unidos National Foreign Assessment Center. Polar Regions. Central Intelligence Agency, 1978.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.