References
- DeVor, R. E.; Chang, T. H.; and Sutherland, J. W. (1992). Statistical Quality Design and Control. Macmillan Publishing Company, New York, NY.
- Montgomery, D. C. (1996). Statistical Quality Control, 3rd ed., John Wiley & Sons, New York, NY.
- Wheeler, D. J. (1993). Understanding Variation: The Key to Managing Chaos. SPC Press, Inc., Knoxville, TN.