ABUHAV, Itay. ISO 9001:2015 - A Complete Guide to Quality Management Systems. Boca Raton: CRC Press, 2021. 421 p. 978-1-03-224042-8.
DONAHUE, Wesley E. Unlocking Lean Six Sigma: A Competency-Based Approach to Applying Continuous Process Improvement Principles and Best Practices (Competency Based Books for Structured Learning). Pennsylvania: Centrestar Learning, 2021. 207 p.
ISBN 9798594575363 .
GOETSCH, David L. and Stanley DAVIS. Quality Management for Organizational Excellence: Introduction to Total Quality. Boston: Pearson, 2021. 9th ed. 429 p.
ISBN 978-0-13-557732-5 .