Gaya APA
Bass, I., Lawton, B.
(2009).
Lean Six Sigma : Using Sigma XL and Minitab
.
America:
McGraw Hill.
Gaya MLA
Bass, Issa., Lawton, Barbara.
"Lean Six Sigma : Using Sigma XL and Minitab".
America:
McGraw Hill,
2009.
Buku.