References

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Dopson, L.R. and D.K. Hayes, 2016. Food and Beverage Cost Control. 6th Edn., John Wiley & Sons, Hoboken, New Jersey,.

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Keller, P., 2005. Six Sigma Demystified. McGraw-Hill, New York, USA., ISBN:0-07-144544-7, Pages: 481.

Keller, P.A., 2001. Six Sigma Deployment: A Guide for Implementing Six Sigma in Your Organization. Quality Publishing, Tucson, Arizona,.

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Wheeler, D.J., 2004. The Six Sigma Practitioner's Guide to Data Analysis. SPC Press, Knoxville, Tennessee,.