Benbow, D. W. (2005). The Certified Six Sigma Black Belt Handbook (3rd ed.). Pearson.
Lua i Stíl Chicago (17ú heag.)Benbow, Donald W. The Certified Six Sigma Black Belt Handbook. 3rd ed. New Delhi: Pearson, 2005.
Lua MLA (9ú heag.)Benbow, Donald W. The Certified Six Sigma Black Belt Handbook. 3rd ed. Pearson, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.