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Lua i Stíl Chicago (17ú heag.)harry, mikel. Six Sigma: The Breakthrough Management Strategy. New York, 2000.
Lua MLA (9ú heag.)harry, mikel. Six Sigma: The Breakthrough Management Strategy. 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.