Gaya APA
Fitriati, A, R. et al (2007).
An introduction to six sigma & process improvement = pengantar six sigma (Jil. 1).
Jakarta:
Salemba Empat.
Gaya MLA
Fitriati, Afia, R.. et al.
"An introduction to six sigma & process improvement = pengantar six sigma".
Jil. 1
Jakarta:
Salemba Empat,
2007.
Text.