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Dyfyniad Arddull ChicagoAnalysis, Asian MetaCentre for Population and Sustainable Development. Asian MetaCentre Research Paper Series. Singapore.
Dyfyniad MLAAnalysis, Asian MetaCentre for Population and Sustainable Development. Asian MetaCentre Research Paper Series. Singapore.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.