Evans, J. (2007). An Introduction to six sigma and process improvement. Thomson Learning.
Chicago-čujuhus (17. p.)Evans, James. An Introduction to Six Sigma and Process Improvement. New Delhi: Thomson Learning, 2007.
MLA-čujuhus (9. p.)Evans, James. An Introduction to Six Sigma and Process Improvement. Thomson Learning, 2007.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.