Cita APA (7th ed.)

Pyzdek, T., & Keller, P. A. (2010). The Six Sigma handbook: A complete guide for green belts, black belts, and managers at all levels (Third edition.). McGraw-Hill Companies.

Cita Chicago (17th ed.)

Pyzdek, Thomas, i Paul A. Keller. The Six Sigma Handbook: A Complete Guide for Green Belts, Black Belts, and Managers at All Levels. Third edition. New York: McGraw-Hill Companies, 2010.

Cita MLA (9th ed.)

Pyzdek, Thomas, i Paul A. Keller. The Six Sigma Handbook: A Complete Guide for Green Belts, Black Belts, and Managers at All Levels. Third edition. McGraw-Hill Companies, 2010.