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Dyfyniad Arddull ChicagoPorter, J.R. Plant Growth: Interaction with Nutrition and Environment. Cambridge: Cambridge University Press, 1991.
Dyfyniad MLAPorter, J.R. Plant Growth: Interaction with Nutrition and Environment. Cambridge University Press, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.