एपीए उद्धरण

Yang Kai. (2005). Design for six sigma for service. American: McGraw -Hill.

शिकागो स्टाइल उद्धरण

Yang Kai. Design for Six Sigma for Service. American: McGraw -Hill, 2005.

एमएलए उद्धरण

Yang Kai. Design for Six Sigma for Service. American: McGraw -Hill, 2005.