References

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Gaspersz, V., 2012. All-in-One Management Toolbook. Tri Albros, Bogor, Indonesia.

Juran, J.M., 1962. Quality Control Handbook. 2nd Edn., McGraw-Hill, New York.

Mayhew, T.M. and H.J. Gundersen, 1996. If you assume, you can make an ass out of u and me: A decade of the disector for stereological counting of particles in 3D space. J. Anat., 188: 1-15.
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Tjiptono, F. and G. Chandra, 2011. Service, Quality and Satisfaction. 3rd Edn., Andi Yogyakarta, Indonesia.

Zimmerman, H.J., 1991. Fuzzy Set Theory and its Applications. 2nd Edn., Kluwer Academic Publishers, Dordrecht, Boston, London, ISNB: 0-7923-9075-X.