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Dyfyniad Arddull ChicagoGoin, Coleman J. Introduction to Herpetology. 2nd ed. San Francisco, 1971.
Dyfyniad MLAGoin, Coleman J. Introduction to Herpetology. 2nd ed. San Francisco, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.