| 1. | Donna C. Summers, Quality, Prentice Hall, 2009. |
| 2. | Donna C. Summers, Quality Management, Prentice Hall, 2008. |
| 3. | David Hoyle, Quality Management Essentials, Routledge, 2007. |
| 4. | Sid Kemp, Quality Management Demystified, McGraw-Hill Professional, 2005. |