Gaya APA
SYUKRON, A., KHOLIL, M.
(2013).
Six sigma: quality for business improvement
.
Yogyakarta:
Graha Ilmu.
Gaya MLA
SYUKRON, Amin., KHOLIL, Muhammad.
"Six sigma: quality for business improvement".
Yogyakarta:
Graha Ilmu,
2013.
Text.