Gaya APA
R.Evans, J., M.Lindsay, W. (2007).
An introduction to six sigma and pocess improvement: pengantar six sigma .
Jakarta:
Salemba Empat.
Gaya MLA
R.Evans, James., M.Lindsay, William.
"An introduction to six sigma and pocess improvement: pengantar six sigma".
Jakarta:
Salemba Empat,
2007.
Text.