GEORGE MICHAEL L. (2003). LEAN SIX SIGMA FOR SERVICE. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGEORGE MICHAEL L. LEAN SIX SIGMA FOR SERVICE. NEW DELHI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGEORGE MICHAEL L. LEAN SIX SIGMA FOR SERVICE. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2003.
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