Breyfogle, Forrest W., III ; Cupello, James M.; Meandows, Becki . (2001). Managing six sigma : a practical guide to understanding, assessing, and implementing the strategy that yields botton-line success. New York : John Wiley and Sons

Breyfogle, Forrest W., III; Cupello, James M.; Meandows, Becki . Managing six sigma : a practical guide to understanding, assessing, and implementing the strategy that yields botton-line success. New York : John Wiley and Sons, 2001

Breyfogle, Forrest W., III ; Cupello, James M.; Meandows, Becki . 2001. Managing six sigma : a practical guide to understanding, assessing, and implementing the strategy that yields botton-line success. John Wiley and Sons, New York