Citazione Stile APA (7a Edizione)

Hayler, R., & Nichols, M. (2005). What is six sigma process management? (First edition.). McGraw-Hill Education.

Citazione stile Chigago Style (17a edizione)

Hayler, Rowland, e Michael Nichols. What Is Six Sigma Process Management? First edition. New York: McGraw-Hill Education, 2005.

Citatione MLA (9a ed.)

Hayler, Rowland, e Michael Nichols. What Is Six Sigma Process Management? First edition. McGraw-Hill Education, 2005.