Pyzdek, Thomas. Six sigma handbook / By Thomas Pyzdek and Paul Keller. - 4th ed. - New Delhi : Tata McGraw Hill Publishing Company Ltd , 2015. - xiv,690 p.; PB 24.7 cm. ISBN: 9789339221775 Subjects--Topical Terms: Dat adriven managementImprove design phaseContro; verify phase Dewey Class. No.: 658.4063 / PYZT