Gaya APA
Evans, J, R. et al (2007).
An Introduction to Six Sigma & Process Improvement Pengantar Six Sigma .
Jakarta:
Salemba Empat.
Gaya MLA
Evans, James, R.. et al.
"An Introduction to Six Sigma & Process Improvement Pengantar Six Sigma".
Jakarta:
Salemba Empat,
2007.
Text.