APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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