Evans, J. (2007). An Introduction to six sigma and process improvement. Thomson Learning.
Lua i Stíl Chicago (17ú heag.)Evans, James. An Introduction to Six Sigma and Process Improvement. New Delhi: Thomson Learning, 2007.
Lua MLA (9ú heag.)Evans, James. An Introduction to Six Sigma and Process Improvement. Thomson Learning, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.