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Dyfyniad Arddull ChicagoRubin, Martin L., and Thomas Harrell. Introduction to the Systems Life Cycle. Princeton: Brandonal Systems Press, 1970.
Dyfyniad MLARubin, Martin L., and Thomas Harrell. Introduction to the Systems Life Cycle. Brandonal Systems Press, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.