Alters, S. (1993). Biology today. Mosby.
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Dyfyniad Arddull Chicago
Alters, Sandra. Biology Today. St. Louis: Mosby, 1993.
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Dyfyniad MLA
Alters, Sandra. Biology Today. Mosby, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.