Evans, J. R., & Lindsay, W. M. (2015). An introduction to six sigma & process improvement (Second edition.). Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Evans, James R., agus William M. Lindsay. An Introduction to Six Sigma & Process Improvement. Second edition. Stamford, Connecticut: Cengage Learning, 2015.
Lua MLA (9ú heag.)Evans, James R., agus William M. Lindsay. An Introduction to Six Sigma & Process Improvement. Second edition. Cengage Learning, 2015.
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