References
- Nelson, L. S. (1988). “Control Charts: Rational Subgroups and Effective Applications”. Journal of Quality Technology 20, pp. 73–75.
- Shewhart, W. A. (1939). Statistics from the Viewpoint of Quality Control. (Reprinted 1986) Dover Publications, Mineola, NY.
- Wetherill, G. B. (1977) Sampling Inspection and Quality Control Chapman & Hall, London, England.
- Wheeler, D. J. (1991) “Shewhart's Charts: Myths, Facts, and Competitors”. ASQC Quality Congress Transactions, pp. 533–538.