Brue, G. (2005). Six sigma for small business.
Lua i Stíl Chicago (17ú heag.)Brue, Greg. Six Sigma for Small Business. Canada, 2005.
Lua MLA (9ú heag.)Brue, Greg. Six Sigma for Small Business. 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.