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2. Deming, W.E. (1986) “Out of the Crisis”,Cambridge, MA: MIT Center for Advanced Engineering Studies.
3. Crosby, P.B. (1979) “Quality is Free”, New York, McGraw-Hill Publishers.
4. Feigenbaum, A.V. (1983) “Total Quality Control”, Third edition, New York, McGraw-Hill Publishers.
5. Taguchi, G. (1986) “Introduction to Quality Engineering—Designing Quality into Products and Processes”, Kraus International, Asian Productivity Organisation, Japan.