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Dyfyniad Arddull ChicagoModell, Martin E. A Professionals Guide to Systems Analysis. McGraw-Hill, 1996.
Dyfyniad MLAModell, Martin E. A Professionals Guide to Systems Analysis. McGraw-Hill, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.