Dyfyniad APA

Richard Wright. "EnvironmentalScience-TowardsaSustainableFuture,9thed.". PHI LEARNING PVT LTD.

Dyfyniad Arddull Chicago

Richard Wright. "EnvironmentalScience-TowardsaSustainableFuture,9thed.". PHI LEARNING PVT LTD.

Dyfyniad MLA

Richard Wright. "EnvironmentalScience-TowardsaSustainableFuture,9thed.". PHI LEARNING PVT LTD.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.