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Dyfyniad Arddull ChicagoSIMPSON ALAN. DBASE INSTANT REFRENCE FOR DBASE III AND III PLUS. NEW DELHI: BPB PUBLICATIONS, 1988.
Dyfyniad MLASIMPSON ALAN. DBASE INSTANT REFRENCE FOR DBASE III AND III PLUS. BPB PUBLICATIONS, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.