References
- Craig, C. C., “The X̄- and R-Chart and Its Competitors”, Journal of Quality Technology, Vol. 1, No. 2, April 1969, pp. 102–104.
- Duncan, Acheson J., Quality Control and Industrial Statistics, 3rd ed., Homewood, Illinois: Richard D. Irwin, Inc., 1965.
- Johnson, N. L. and Leone, F. C., “Cumulative Sum Control Charts—Mathematical Principles Applied to their Construction and Use,”, Industrial Quality Control, Vol. 18, No. 12, June 1962, pp. 15–21.
- Truax, H. Mack, “Atlas Tries Out New Process Control Charts,” Chemical and Engineering News, March 21, 1960, pp. 50–51.