Gygi, Craig
Six sigma workbook for dummies
Wiley, 2006
 Buku Teks
Brue, Greg
Six sigma
McGraw-Hill, 2006
 Buku Teks
Breyfogle, Forrest W.
Managing six sigma
John Wiley & Sons, 2001
 Buku Teks
Strategi bisnis six sigma
Manajemen Usahawan Indonesia, XXXII (01) Januari 2003: 47-49, 2003
 Artikel Jurnal
Pande, Pete
What is six sigma?
McGraw-Hill, 2002
 Buku Teks