Gaya APA
Syukron, A., Kholil, M.
(2013).
Six sigma: quality for bussiness improvement
.
Yogyakarta:
Graha Ilmu.
Gaya MLA
Syukron, Amin., Kholil, Muhammad.
"Six sigma: quality for bussiness improvement".
Yogyakarta:
Graha Ilmu,
2013.
Text.