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Dyfyniad Arddull ChicagoFRIED, George H. Schaum's Outline Of Theory And Problems Of Biology. McGraw-Hill, 1990.
Dyfyniad MLAFRIED, George H. Schaum's Outline Of Theory And Problems Of Biology. McGraw-Hill, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.