Kubiak, T. M. (2014). The ASQ pocket guide for the certified six sigma black belt. ASQ Quality Press.
Lua i Stíl Chicago (17ú heag.)Kubiak, T. M. The ASQ Pocket Guide for the Certified Six Sigma Black Belt. Milwaukee, Wisconsin: ASQ Quality Press, 2014.
Lua MLA (9ú heag.)Kubiak, T. M. The ASQ Pocket Guide for the Certified Six Sigma Black Belt. ASQ Quality Press, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.