Citazione Stile APA (7a Edizione)

Pyzdek, T., & Keller, P. A. The Six Sigma handbook: A complete guide for green belts, black belts, and managers at all levels (6th. ed.).

Citazione stile Chigago Style (17a edizione)

Pyzdek, Thomas, e Paul A. Keller. The Six Sigma Handbook: A Complete Guide for Green Belts, Black Belts, and Managers at All Levels. 6th. ed.

Citatione MLA (9a ed.)

Pyzdek, Thomas, e Paul A. Keller. The Six Sigma Handbook: A Complete Guide for Green Belts, Black Belts, and Managers at All Levels. 6th. ed.