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Dyfyniad Arddull ChicagoStidworthy, John. Macmillan Revised ENCYCLOPEDIA of SCIENCE Plants and Animal 5. Macmillan Reference, 1997.
Dyfyniad MLAStidworthy, John. Macmillan Revised ENCYCLOPEDIA of SCIENCE Plants and Animal 5. Macmillan Reference, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.