Pande, P. (2002). What is six sigma?
Lua i Stíl Chicago (17ú heag.)Pande, Pete. What Is Six Sigma? New Delhi, 2002.
Lua MLA (9ú heag.)Pande, Pete. What Is Six Sigma? 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.