Gaya APA
Syukron, A., Kholil, I, M. (2013).
SIX SIGMA Quality for Business Improvement (1).
Yogyakarta:
GRAHA ILMU.
Gaya MLA
Syukron, Amin., Kholil, Ir., Muhammad.
"SIX SIGMA Quality for Business Improvement".
1
Yogyakarta:
GRAHA ILMU,
2013.
Text Book Digita Bisnis.