Keller, Paul A. Six sigma demystified / by Paul Keller. - 2nd ed. - 1 online resource (xiv, 510 pages) Includes bibliographical references and index. ISBN: 9780071760829 LCCN: 2020755368 Subjects--Topical Terms: Six sigma (Norma de control de calidad) Dewey Class. No.: 658.4013