Sarkar, D. (2004). Lessons in six sigma. Response.
Lua i Stíl Chicago (17ú heag.)Sarkar, Debashis. Lessons in Six Sigma. New delhi: Response, 2004.
Lua MLA (9ú heag.)Sarkar, Debashis. Lessons in Six Sigma. Response, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.