Gaya APA
Syukron, A., Kholil, M. (2013).
SIX SIGMA: quality for business improvement (Ed.1, Cet.1).
Yogyakarta:
Graha Ilmu.
Gaya MLA
Syukron, Amin., Kholil, Muhammad.
"SIX SIGMA: quality for business improvement".
Ed.1, Cet.1
Yogyakarta:
Graha Ilmu,
2013.
Textbook.