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Dyfyniad Arddull ChicagoAmador Astúa, Jorge Alberto, et al. State of the Climate in 2018. 2019.
Dyfyniad MLAAmador Astúa, Jorge Alberto, et al. State of the Climate in 2018. 2019.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.