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Dyfyniad Arddull Chicago"DFA Exec Favors Gradual Adoption of Open Skies." Manila Bulletin 2007.
Dyfyniad MLA"DFA Exec Favors Gradual Adoption of Open Skies." Manila Bulletin, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.