1. C.W. Adams, P. Gupta, C.E. Wilson, Six Sigma Deployment (Butterworth-Heinemann, Burlington, MA, 2003) ISBN 0-7506-7523-3. OCLC 50693105
2. T. Bertels, Rath & Strong’s Six Sigma Leadership Handbook (John Wiley and Sons, New York, NY, 2003), pp. 57–83. ISBN 0-471-25124-0
3. F.W. Breyfogle III, Implementing Six Sigma: Smarter Solutions Using Statistical Methods (John Wiley & Sons, New York, NY, 1999) ISBN 0-471-26572-1. OCLC 50606471
4. C.E. Cordy, L.R.R. Coryea, Champion’s Practical Six Sigma Summary (Xlibris Corporation, Bloomington, IN, 2006)
5. T. Dasgupta, Using the six-sigma metric to measure and improve the performance of a supply chain. Total Qual. Manag. Bus. Excell. 14(3), 355–366 (2003). https://doi.org/10.1080/1478336032000046652. ISSN 1478-3363