Gaya APA
Holpp, P, P, D, L.
(2007).
What Is Sigma Berpikir Cepat Six Sigma
.
Yogyakarta:
Andi.
Gaya MLA
Holpp, Pete, Pande, Dan, Larry.
"What Is Sigma Berpikir Cepat Six Sigma".
Yogyakarta:
Andi,
2007.
Computer File.