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Dyfyniad Arddull ChicagoWilson, Paul F., Larry D. Dell, and Gaylord F. Anderson. Root Cause Analysis: A Tool for Total Quality Management. New Delhi: Tata McGraw-Hill, 1993.
Dyfyniad MLAWilson, Paul F., et al. Root Cause Analysis: A Tool for Total Quality Management. Tata McGraw-Hill, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.