Davis R. Bothe, 2002, "Statistical Reason for the 1.5s Shift", Quality Engineering, issue 14, Vol 3, pp479-487
Joseph A. De Feo & William Barnard. JURAN Institute's Six Sigma Breakthrough and Beyond - Quality Performance Breakthrough Methods, Tata McGraw-Hill Publishing Company Limited, 2005. ISBN 0-07-059881-9
แหล่งข้อมูลอื่น
6 sigma ที่ GotoKnow.org
Yang, Kai and El-Haik, Basem, 2003, Design for Six Sigma: A Roadmap for Product Development, McGraw-Hill, NY, ISBN 0-07-141208-5
สิงหาคม 08, 2021
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