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Dyfyniad Arddull ChicagoHawkins, J., C. Hughes, and R. Scotland. Primary Homology Assessment, Characters and Character States. 1997.
Dyfyniad MLAHawkins, J., et al. Primary Homology Assessment, Characters and Character States. 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.