Evans, J. R., & Lindsay, W. M. (2005). An introduction to six sigma & process improvement. Thomson.
Lua i Stíl Chicago (17ú heag.)Evans, James Robert, agus William M. Lindsay. An Introduction to Six Sigma & Process Improvement. Australia: Thomson, 2005.
Lua MLA (9ú heag.)Evans, James Robert, agus William M. Lindsay. An Introduction to Six Sigma & Process Improvement. Thomson, 2005.
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