References
- Deming, W. E. (1986). Out of the Crisis. MIT CAES, Cambridge, MA.
- MacGregor, J. F. (1990). “A Different View of the Funnel Experiment”. Journal of Quality Technology 22, pp. 255–259.
- Nelson, L. S. (1984). “The Shewhart Control Chart—Tests for Special Causes”. Journal of Quality Technology 16, pp. 237–239.
- Nelson, L. S. (1985). “Interpreting Shewhart X-bar Control Charts”. Journal of Quality Technology 17, pp. 114–116.