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Lua i Stíl Chicago (17ú heag.)Brussee, Warren. Six Sigma On A Budget. New Delhi: Tata McGraw-Hill, 2010.
Lua MLA (9ú heag.)Brussee, Warren. Six Sigma On A Budget. Tata McGraw-Hill, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.