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Dyfyniad Arddull ChicagoHill, Walter E. Genetic Engineering: A Primer. Amsterdam: Harwood Academic Publishers, 2004.
Dyfyniad MLAHill, Walter E. Genetic Engineering: A Primer. Harwood Academic Publishers, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.