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Dyfyniad Arddull ChicagoWhitten, Jeffrey L., Lonnie D. Bentley, and Victor M. Barlow. Systems Analysis & Design Methods. 2nd ed. Homewood, Ill: Irwin, 1989.
Dyfyniad MLAWhitten, Jeffrey L., et al. Systems Analysis & Design Methods. 2nd ed. Irwin, 1989.
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