Gaya APA
, A, S., Khoil, M.
(2013).
Six Sigma: Quality for Business Improvement
(
Pertama)
.
Yogyakarta:
Graha Ilmu.
Gaya MLA
, Amin, Syukron., Khoil, Muhammad.
"Six Sigma: Quality for Business Improvement ".
Pertama
Yogyakarta:
Graha Ilmu,
2013.
.