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Dyfyniad Arddull ChicagoJenkins, Lyle. Variation and Universals in Biolinguistics. London / New York: Elsevier, 2004.
Dyfyniad MLAJenkins, Lyle. Variation and Universals in Biolinguistics. London / New York: Elsevier, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.