Pande, P. S., & Holpp, L. (2002). What is six sigma? McGraw-Hill ; Tata McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Pande, Peter S., agus Lawrence Holpp. What Is Six Sigma? New York : New Delhi: McGraw-Hill ; Tata McGraw Hill, 2002.
Lua MLA (8ú heag.)Pande, Peter S., agus Lawrence Holpp. What Is Six Sigma? McGraw-Hill ; Tata McGraw Hill, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.