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Dyfyniad Arddull ChicagoJohansen, Donald Alexander. Plant Embryology. Dehradun: Bishen Singh, Mahendrapal Singh, 1990.
Dyfyniad MLAJohansen, Donald Alexander. Plant Embryology. Bishen Singh, Mahendrapal Singh, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.