Lua APA (7ú heag.)

Keller, P. A. (2005). Six sigma demystified. McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Keller, Paul A. Six Sigma Demystified. New York: McGraw-Hill, 2005.

Lua MLA (8ú heag.)

Keller, Paul A. Six Sigma Demystified. McGraw-Hill, 2005.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.