Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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