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Dyfyniad Arddull ChicagoCommission on Adult Basic Education (U.S.). Adult Basic Education. Athens, Ga.: Commission on Adult Basic Education, 1990.
Dyfyniad MLACommission on Adult Basic Education (U.S.). Adult Basic Education. Commission on Adult Basic Education, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.