Kumar, D. (2006). Six sigma best practices: A guide to business process excellence for diverse industries. J. Ross Pub..
Chicago-referens (17:e uppl.)Kumar, Dhirendra. Six Sigma Best Practices: A Guide to Business Process Excellence for Diverse Industries. Ft. Lauderdale, Fla.: J. Ross Pub., 2006.
MLA-referens (9:e uppl.)Kumar, Dhirendra. Six Sigma Best Practices: A Guide to Business Process Excellence for Diverse Industries. J. Ross Pub., 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.