Gaya APA
Evans, J, R. (2007).
An Introduction to Six Sigma and Process Improvement = Pengantar Six Sigma (1).
Jakarta:
Salemba Empat.
Gaya MLA
Evans, James, R..
"An Introduction to Six Sigma and Process Improvement = Pengantar Six Sigma".
1
Jakarta:
Salemba Empat,
2007.
Text.