Cita APA (7th ed.)

Pyzdek, T., & Keller, P. A. (2018). The six sigma handbook (Fifth edition.). McGraw-Hill Education.

Cita Chicago (17th ed.)

Pyzdek, Thomas, i Paul A. Keller. The Six Sigma Handbook. Fifth edition. New York: McGraw-Hill Education, 2018.

Cita MLA (9th ed.)

Pyzdek, Thomas, i Paul A. Keller. The Six Sigma Handbook. Fifth edition. McGraw-Hill Education, 2018.